Breast Lumps in Boys

Parents are concerned when they find breast lumps in boys. They hope it's normal, but underneath lies a common fear--it might be a tumor!


Dr. Greene, my 12-year-old son has a sore lump directly under his nipple. Could this be puberty related? This lump is tiny and hard and underneath the skin of the nipple. Thanks for your help!
Alberta, Canada

Dr. Greene's Answer

Lumps of one kind or another are a common reason for a visit to the doctor’s office. The lump might be in the neck (that the parents suspect is just a swollen gland), in the knee (that the parents think is from sliding into third base last month), or under the nipple (that the parents hope is due to puberty). I often enjoy seeing parents with these concerns in my own office. Sometimes the parents feel that they shouldn’t even bother their doctor with this because it’s probably normal. But underneath these hopeful, at-home diagnoses lies a common fear for breast lumps in boys–it might be a tumor!

Most lumps in children are not cancerous and are not serious. Thankfully, childhood cancer is uncommon. But parents’ fears are not unfounded. Childhood breast cancer is quite rare, but it certainly does occur, even in boys. In males of all ages, breast cancer accounts for less than 1% of all cancers (American Surgeon, 1999; 65:250–253). But if it is your son, any chance of cancer seems too much. And a lump might be the first sign noticed.

Breast lumps in children often give rise to two immediate fears–Could it be a tumor? Or could something be going wrong with puberty? (A third fear–Will my child be teased?–arises if the first two turn out to be no problem.)

When to be Concerned about Breast Lumps in Boys & When to Relax

I’ll give you some guidelines for when to be concerned about a breast lump and when you can relax.

Puberty is a time of dramatic changes in the body, especially in the reproductive system. These transformations are brought about by surges of complex and precisely balanced hormones. The last time your 12-year-old had these tides of hormones was when he was a newborn–but then the hormones were yours. Coursing through his blood, your hormones matured his lungs, made him ready for life in the big outside world, and along the way may have given him baby acne and breast enlargement–even nipples that leaked milk. This precious newborn season was gone in a blink.

Now your 12-year-old is making surges of these same hormones on his own as his body turns into an adult’s–a miracle not unlike when you helped turn his body into a newborn’s.

There are five stages of the changes that occur during puberty, called Tanner stages or Sexual Maturity Rating (SMR) stages. Breast lumps in boys are common during SMR 3 and SMR 4.

In boys, SMR 3 usually begins at about age 12 or 13 years and lasts a year or so, although it can be normal in our culture to begin as early as 10 years or as late as 14.9 years, according to Tanner (Journal of Pediatrics, 1985; 107:317). SMR 3 is the time when the testes get clearly larger, the penis gets noticeably longer (then thicker in SMR 4), and the pubic hair (though still small in amount) gets darker and starts to curl.

Sperm is first produced during SMR 3.

Boys grow at their fastest during SMR 3 and SMR 4 (girls get their growth spurts earlier). With your son, you’re probably seeing him outgrow his beginning-of-the-year school clothes already–especially his shoes. During SMR 3, the feet and hands usually grow first, then the arms and legs, and finally the trunk–giving them that adorable adolescent gawky look (don’t tell my 12-year-old son I said that).

SMR 3 also marks the beginning of significant underarm perspiration (the odor, as you’ve probably noticed, can start much earlier).

And teenage acne usually begins at SMR 3, continuing on until the end of puberty.

In newborns, baby acne and breast buds often occur at about the same time. In the same way, many adolescent boys develop gynecomastia–true mammary breast tissue in a male–during SMR 3. The firm lump may occur under only one nipple, under both nipples, or under the two at different rates or sizes. The lumps are often tender when they are growing the fastest. In at least 90% of kids, these will go away on their own. They may disappear as quickly as in a few months, but it is not unusual for them to last up to 2 years (Nelson Textbook of Pediatrics, WB Saunders, 2004). In some children, they may persist without being a problem. Gynecomastia occurs in at least 40% to 60% of boys (Fortschritte der Medizin, 1998; 116:23–26).

Gynecomastia can run in families, and when it does, the disappearance pattern tends to be similar in the family. Gynecomastia can happen in boys of any size but it is more common in bigger teens–either taller, heavier, or both. Obesity can certainly be a cause of gynecomastia in some children (Clinical Pediatrcs, 1998; 37:367–371).

Gynecomastia is different, though, than fatty tissue in the breast area. Boys tend to store extra fat in the upper body (breast and abdomen area), but girls are much more likely to store it in the lower body, particularly the thighs (Pediatrics, 1998; 102:e4). This is the first place it goes on and the last place it comes off. If girls’ breasts do enlarge by storing fat, this is usually one of the first places it disappears with weight loss.

Times to Worry about Breast Lumps in Boys (Not a Newborn)

  • If they begin before age 10 years or after age 15 years (especially after puberty is complete)
  • If they are not directly under the nipple
  • If there is overlying dimpling of the skin, skin ulceration, or change in the color of the skin
  • If the they feel fixed to the skin
  • If they are large–over 1.5 inches (4 cm) in diameter
  • If they don’t go away within 2 years
  • If the nipples leak milk, blood, pus, or other fluid
  • If there are other signs of disease–night sweats, fever, or weight loss, for example

These are all situations in which a breast lump should definitely be examined, in addition to the important regularly scheduled physicals during the puberty years. These children should have a careful physical examination right away. They should probably have an endocrinology (hormone) workup and perhaps an ultrasound or a mammogram, depending on the exam. I would also consult with a health care provider if a breast lump is associated with any signs of infection, such as sudden increased size, warmth, tenderness, drainage, redness, or fevers.


In a recent study at Johns Hopkins University of 60 high-risk boys with large lumps (> 4 cm), most of the boys–45 of them–turned out to be fine, but 15 did have significant medical problems, including one who had a serious cancer. Most of the problems were genetic (such as Klinefelter’s syndrome–XXY boys) or hormonal problems that needed to be treated (Clinical Pediatrics, 1998; 37:367–371). Gynecomastia can also be a side effect of taking steroids or other medications. It can come from liver disease, testicular disease, or neurologic diseases.

If you are ever unsure whether a breast lump is normal, it is always wise to seek the advice and opinion of your child’s doctor.

Good Breast Health Practices for Teens

  • Avoiding steroid supplements
  • Avoiding steroid medicines where possible (e.g., keep asthma well controlled with preventive measures)
  • Avoiding cigarette smoking and exposure to second-hand smoke
  • Avoiding alcohol
  • Being physically active daily (exercise)
  • Eating a healthy, whole food diet
  • Maintaining ideal weight
  • Avoiding piercing and tattooing

If normal, benign gynecomastia is bothersome, either because it is large or because it doesn’t go away as puberty progresses, treatment is possible. Sometimes hormones are given to try to shrink the breast tissue. Alternatively, the mammary breast tissue can be removed. A tiny incision is made under the armpit, and the tissue is removed with a fiberoptic scope. The results are great, and the scar is small and inconspicuous (Annals of Plastic Surgery, 1998; 40:62–64).

Normal, small gynecomastia is yet another reminder of the wonderful changes in your son’s body as he becomes a man. While teenagers can be quite trying to live with at times, savor every moment you can as you enter the last few years of having your son in your home.

Did this article help answer your questions on Breast Lumps in teens? Do you still have questions? Let us know in the comments below.

Last medical review on: June 05, 2015
About the Author
Photo of Alan Greene MD
Dr. Greene is a practicing physician, author, national and international TEDx speaker, and global health advocate. He is a graduate of Princeton University and University of California San Francisco.
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Very Nice information. really helpful and relieves tension.Thank you sooo much.

Thanks a lot for all this wonderful information. Last night my 13 yrs old son noticed this lump inside his chest , we really got worried…..haphazardly I started searching for the answers on the Internet and luckily I found my answers here..I my really great ful . Now we are all relaxed ….BT as u have also shown some other signs ….We will keep a regular check.

Hi Urvashi,

Thanks so much for your response and the kind words. We very much hope our content will be a help to families like yours.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

Thank you. I’m a 21 year old male and I’ve had a lump in my right nipple since I was about 10 years old. It has never hurt when touched or squeezed and has been rather slowly decreasing in size and thickness over the years. When I was younger, I was told by family that it was a part of puberty and would go away eventually. I’ve never been to doctor for it specifically, but on a recent checkup I asked about it and was also told it should go down with time.

I only started looking up more information after feeling a pain in the right side of my chest though not emitted from the lump. I do hope it completely disappears soon without complication.

Thank you so much for the extensive detail associated with tender lumps directly underneath a young boy’s nipple area. Me & my 12 yr old son feel so much better after reading this informative article. As of this time we are both pretty sure that his one tender knot directly underneath his nipple area is just an average part of growing up. Thank you for the knowledge and preventing us from overreacting and yes we are aware that we are still advised to continue to monitor the size and duration of this lump. But again- thank you for the expert medical advice without having to waste time (ours & the doctor ‘s)

Thank a lot I have spent 7 years with these lumps am I adviced to go for an operation


Per Dr. Greene’s recommendations for lumps in boys that last longer than 2 years: “[these] breast lump[s] should definitely be examined, in addition to the important regularly scheduled physicals during the puberty years. These children should have a careful physical examination right away. They should probably have an endocrinology (hormone) workup and perhaps an ultrasound or a mammogram, depending on the exam.” Treatment will be based on the findings of the exam. Surgery may or may not be the best course of action.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

Thank you so much, that was the best article I’ve read, I know have a better understanding about it all. My son (13) told me he found this tender lump under the nipple, I did panic ( but I did not show him my fear) as is hard to see a doctor this days, with all the problem we are going through with the pandemic, I’ve been searching for info for few days now and today I came across this fabulous page…. thank you so much for all the advice Dr Greene

this was very helpful but am seem to be concerned about my 7 year old son lambs are on the right and other on his left
ive been rubbing his with a whom cloth to ease the swelling and hard but they are not going away and is been 8 months now.

please assist

thanks in advance

Hi Walter,

Just checking in to see if your son’s breast lumps have resolved? If not, it may be time to see a pediatrician.

Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

That was most helpful .
He is the eldest of three boys and I was getting alarmed as I haven’t been through this before!
If I had girls , I would have been more clued up.
I love your finishing comment about cherishing our teens while we can.
I am enjoying seeing my boy grow into the man he will become.
Thank you

Hi this has been helpful he noticed the lump last night and I just panicked, I have really prayed and I thank God that this is part of puberty… Thank you thank you

Dr Greene, please my 14 yr old boy is always sad. Why? this is because his left breast is growing big and his friends call him names. It saddens me to see my son going through such pains. Please what should I do?

Hi Victor,

How tough for your son — and for you to see him so sad.

Have you taken him to a doctor? If so did the doctor say this is normal and transitory? That would be the best news because it means the breast size will resolve on its own and no treatment is needed. At this point, your son’s biggest problem is facing his peers. He may not be able to do it, but if he can he may say “my doctor is on tops of this. It’s normal and I’ll grow out of it.” By not giving his peers ammunition to make fun of him, they may just stop.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

Once I initially commented I clicked the -Notify me when new comments are added- checkbox and now every time a comment is added I get four emails with the identical comment. Is there any means you possibly can take away me from that service? Thanks!


I tried to remove you from our list, but the email address you used for this comment hasn’t been used for other comments — it does not show up at all in database.

Please use the Contact Us form to provide more information including the email address where you are receiving the unwanted updates. When you submit that form it will go to the people who can help, but will not be seen by other Users or generate any more unwanted emails.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

i am 14 year boy and i have lumps under both nipples 2.5 to 3 years are passed but lumps are not going also size of nipple is increased and lumps are coming outward of my skin. what to do sir.

Hi your article is very informative.
My son is 11th he noticed a hard lump in rt breast just above and lateral to the nipple of rt breast with pain 2days back. O/E hard mobile lump about 1×2cm in size which is tender. Need your opinion

Great article, it was very helpful. My son is 10 and I’m almost 100% certain he is starting puberty. He noticed a lump behind his nipple and told me about it. I felt it and its hard and moveable. Just wondering if that is normal since its not under the nipple or to the side but right behind it.

I had breast lump in my right side of chest at my onset of puberty when I was 13 but it disappeared after some months.But now I am 16 and a lump has formed in my right side of chest.I feel pain after pressing it.please help me.

Even me too, I have the same problem just exactly as you, it has been 2 years that I start having nipple in my chest.

Thank you for all the information. I have 2 sons and one has already had a “mass” Gynecomastia, was what the Dr said was removed at the age of 20. It was first checked when he was 16, and we were told to wait. It was removed and no other problems were found. Now my 14 year old has developed one. Fingers crossed it is just the hormonal changes but it has increased in size in less than week. I think it best to have it checked now, any comments would be appreciated.

Than you

I’m a male and I’m 25 years old, I have a lump in my left breast for like 13 years now, and it’s still there. Before it was the two breasts, but one disappeared but the other one is still there,anytime o squeeze it,i feel pains,can it be cancer?.

Thank you so much!!! This article was very helpful 😀

Thank you for the wonderfully thorough information.

You’re most welcome!

I am currently 16 year old in my both chest there is some lumbs and chest is started swelling.i think it started from 2 years ago.but still it remains .my right chest must bigger than in the left .sometimes i hapened to see that the nipple in my right chest become larger and when press it a liquid will appear then the nipple become the size as the same .because this i can’t use tshirts and when i wear a shirt the nipple will project outside .its not comfortable to me .its like a ashame to me .when i’m with my friends i feel shyness.what is the reasom behind this .when i consulted a docter she recomend me do some physical works and do drink much more water and she said that it will disappear after some time.but i not much sure about it .what can i do .it become as like a burden to me please please help me

Hi I’m like thirteen and I’m going to the seventh grade, I’m kind of worried And scared as well, well basically my left nipple is very big while the right one is normal! I’m 13 and 50 kg , I don’t really want to tell my family about this and I was kind of scared if it’s breast cancer or something,please reply I am very scared , well I don’t really do exercises and I eat junk food too , so should I change those? And should I tell me parents about this? Please please please reply , btw it doesn’t hurt unless I touch it , but it’s pretty obvious and my friends are starting to notice it.

The fact that your friends are noticing means it’s probably time to tell your parents and go see a doc. If you have a physical before school starts, you could tell your doctor then, too. Or maybe make a special appointment. Not that it’s a big deal, but it’s good for you to have someone do a physical exam and tell you it’s okay.

Having a better diet and exercising are always smart … no matter how old you are or what you’re dealing with.

Very useful article

i have two lumps under both nipples, the left one used to be sore a while ago,but it shrieked in size and i does not hurt any more (it is still there). the other one came later, and it still is sore and when i squeeze it a white watery liquid comes out, even if just a little bit. i am currently 13 and the lumps are too small to be noticed trough a shirt of any kind, but because they are disk shaped they are pretty visible if i went swimming or something.


I’m not a Dr but this is normal. I had the same thing along with my brother wen puberty started. You are fine they will go away in time.

also i am sure that it is not cancer, all the symptoms correspond whit gyneocomastia (until the white watery liquid part)

Hi, Im 19 years old. When I was younger, I had bumps under both nipples. I was assuming Puberty. I went away for a few years, but now its back. There is no liquid, its just sore. Is it bad?

Hello I’m 12 years old male, I have these kind of big lumps under my nipples and have been having the left nipple lump for about 3 months and the right nipple lump for about 3 weeks. I’m really scared because my left nipple gets puffy sometimes and flat sometimes but more puffy often and the right lump I’m really scared of more because I feel like there is a bug inside of my nipple.
It hurts a little bit when I press on it but hurts a little bit more when I press it hard. I’ve had the left lump before about a year ago then came back 3 months ago. Plz tell me if I have breast cancer or if the lumps are harmful or harmless. Plz I don’t want to die:(. And also tell me if bugs can grow inside my nipple plzzz. Should I get it checked out?!?
Thank yoy for reading, PLZZ TELL ME AS SOON AS YOU CAN.

Doubt this is going to get a reply, but does anyone else have a lump that looks like another nipple? Sometime’s it’s tender but sometimes, it’s not. When you squeeze it you can feel this thin vein thingy or string underneath it. Is it a normal symptom of puberty or gynecomastia? Is it a breast bud?

Hi I’m 15 years old . I was wondering if having a bump/lump directly behind my left nipple a bad sign. I have had this lump/bump since I was 14 years old. And if I were to press on the bump/lump it hurts. I can also move it around but not a lot. And my left nipple seems to be fatter the my right nipple.

Im 14 and i have a big bump under my left nipple but my right nipple is the same as always. Is this normal or shoild i see a doctor


I am 16 year old and I have a lump under my right nipple and if i touch or press it i have a severe pain but on left side there is no lump but I can feel very little pain. And one more thing i was having lump at the age of 12-13 to, so please tell me about it is it normal or what should I do for it. Will be waiting for your answer😊.

hi i have on lump under my nipple but nothing else on the other side does any know what it is

I’m 15 and have a pretty big lump under my right nipple and only a small one under my left one. My puberty started about 6 months ago. It hurts pretty bad when someone touches the lump under my nipple. My hobby is Taekwondo and I just hate it when someone hits me in my nipple. I think that the lump has gotten bigger when it has constantly been hit. What do you think, should I get it checked?

Just kick them,,,.joke!!actually we have same cases but ur so lucky you have a parents to tell that can help you immediatly not like me I’m scared to tell them and also we are just poor family. I’m just praying and hoping to lord

I’m 10 and have a small lump under my nipple. I have experienced some symptoms of puberty but not many. I am worried even though I know it is probably nothing. I just want to make sure that the doctor thinks it is okay. I’ve already gotten it checked out at the doctor but I am paranoid. She said it was breast bud. So she’s probably right. It is tender to the touch. Sometimes it hurts though. Thanks for reading!

I’m 11 now, got another lump under my left breast now. Both of my nipples have a line through them and my left lump is tender and painful. The right one doesn’t hurt unless I push super hard anymore. Please respond sir. I have a great fear of death. These lumps are making me lose self confidence and making me depressed.

lumps under each nipple for a few weeks, painful, easily moveable, and relatively small… I have also noticed a little bit of pain in the armpits… not sure, is this cancerous? I am not sure because it is unlikely that it would affect both sides if it was really bad right?

I have had lump under my right nipple for maybe a couple of months i have gone to the doctors and he said it’s nothing to worry about it’s probably A nipple bud but I also have a small pain under my nipple and it’s worrying me to shit do u think I have a big risk of cancer I am a 13 year old healthy male

Hello, I am 16 years old and developed a lump underneath my left nipple around 1 – 2 weeks ago. I got it checked out and my docor thinks it’s a breast bud. It slightly hurts when I touch it, but other times it doesn’t. Another thing to note is that there is no discharge coming from the nipple, but my nipples are slightly red, in which my doctor told me that the redness can be from rubbing against my clothing. Should I be concerned about getting breast cancer? Or does this just sound like an actual breast bud?

Hi im aaron and i have the little lump under my nipple but when u wrote things to worry about only one of them came up and that was if it was fixed to the skin im not shur if it is but it moves if i move my nipple

I have the same. I just recently noticed it but it’s playing on my mind. I’m 13 but I don’t think it’s anything to worry about because two of my friends the same age had it and it just went after a while.

i have the same thing and i really want to know this answer… very concerning, and i am also having lumps under both nipples, and my armpits are hurting… i am 13 and have noticed this for two and a half weeks… can someone just help me(and aaron)??? I am trying to go see a doctor, but would like to have some background knowledge before i see them…

I have a Lump under my right nipple and it is around the size of a pea ( maybe a bit bigger ). I have had it for around 3 weeks and I have noticed that some squishy , fat like stuff has built up around it . It has not changed the appearance of my breast or nipple ( p.s Im skinny ) and I’am almost 14.

Dear; Doctor

I am a 14 years old boy and I have a small lump under my right nipple and i was wondering if it’s harmful.
So please if your reading this tell me if it’s normal or if it’s breast cancer.Thank you

It’s probably nothing but if it is still there after you turn 15 I would get it checked out.

Hi dr Greene. I have a small odd shaped lump that is attached to my skin, but it is directly under my nipple. It sometimes hurts when I touch it. The nipple on the outside is sometimes hard and bumpy, and it is sometimes puffy and big. Is this just gynecomastia, or should I be worried about something else. Thanks

hi doc
i’m a male 19 years of age .. i’ve got this lump under my right nipple which has been there for a month and half now . it started small though but not till now i just found out that when i press it a white liquid comes out of my nipple is this normal please?

if you havent already go to the hospital bro. White liquid is a sign of male breast cancer. If you treat it early you will be ok.

(Male) Hi im 14 and i will be 15 in May 10. My right nipple is hard sometimes and i think something is behind it. It hurts when i touch it and its shape is like a disc. It is small but i can feel the difference when i touch both of my nipples. My left nipple is normal it doesnt have a round shape when i pinch it. Please help me, i dont really like going to hospitals for surgery etc. I hope this is normal :(

I have brest problen my right sight brest day dy day it going to big and it is so painfull.
So what I can do.
Plese help me.

I am 14 yrs old. I am lump in both of my nipple and it hurts when i pressed it. It sometime become thick and sometime small.I have passed 7 months having this.Will it go or not.Isnit cancerous?

Hi I’m 14 years old and I’m a male and I have a small lump under my right nipple and it also hurts a bit when I poke it .And it is there for about 5 days .


Thanks for writing in.

As Dr. Greene says, “… at least 40% to 60% of boys” will experience breast lumps during puberty. These can be a normal part of puberty.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.

Hi lm 15 turning 16 lve been having lumps since l was twelve they havent disappeared at all and they are not painful do l get rid of them

im 13 (boy) and a half yrs old and i have a lump under both nipples and a slight rash around the right nipple. when i squeeze them a liquid comes out and it looks like puss. should i worry about this?

get it checked by your doctor ..

Hi. I am yusuf. Am a 17 year old male.. i can feel a lump in my right breast an when i touch it its not painful and soft!

Your lump is most likely a cyst go get it checked out ~ 11 year old kid

Hi i am 13 and none of the symptoms apply expect that it feels like it is fixed to the skin. Is this a problem

Ye im the same have you got a reply or anyting?

I m 23 now, there are lumps underneath my both nipples from when I was 13 or 14 ….should me worry about it?

Hi, thanks for writing in!

As Dr. Greene writes, times to worry about breast lumps are: “If they begin before age 10 years or after age 15 years (especially after puberty is complete),
If they are not directly under the nipple,
If there is overlying dimpling of the skin, skin ulceration, or change in the color of the skin,
If the they feel fixed to the skin,
If they are large–over 1.5 inches (4 cm) in diameter,
If they don’t go away within 2 years,
If the nipples leak milk, blood, pus, or other fluid,
If there are other signs of disease–night sweats, fever, or weight loss, for example.
These are all situations in which a breast lump should definitely be examined.”

I hope that helps!
Alexandra (caring helper at, not a doctor)

I turned 15 about two months ago and I have a lump for about a year and I’m worried because I was touching it and a clear liquid came out. I have it on both sides but I researched it and I’m scared about what I have found. I found that I could have cancer but hopefully I am going to see a doctor soon. Should I be worried or not?

im 12 and i have a lump on my breast im a boy does it mean i have breast cancer and the lump is hard and painfyl

Hi there, I turned 20 two months ago. Little over one year ago, I had a depression which affected me physically. I lost muscle, was sweating a lot during the day and night and two lumps formed under my nipples. My thought it that that was a hormonal imbalance. I excercised a lot and drank alot of water while avoiding alcohol and I started feeling motivated and happy again. I am now mentally and physically in top condition except one thing. Two tiny lumps under my nipples. It ruins the look of my chest (when I look in the mirror other people dont seem to notice) and reminds me everyday of the nasty period I had. How do I best combat it? My guess is that it needs to go quickly as I heard the longer its there the harder it is to get rid of it. It ruins a crucial part of my self image and really needs to go. Id love to hear from you.

I`m 17 year old and i have round lump directly under my left bearst. Is it dangerous?
It`s started 2 weeks from now. and I am very curious about it.
What should i do?


Thanks for writing in.

Please check here for a list of the changes that occur during puberty and to determine your stage of puberty. If you are still going through puberty, consider this … Dr. Greene says, “… at least 40% to 60% of boys will experience breast lumps during puberty.” If you’ve completed puberty, in my opinion, it would be wise to discuss this with your doctor.

I hope that helps.
Best, @MsGreene
Note: I am the co-founder of, but I am not Dr. Greene and I am not a doctor. Please keep that in mind when reading my comments and replies.