My son, Jerimie, is seven years old. Ever since he was two he has developed a skin condition that looks similar to ringworm. We have taken him to the doctor for a diagnosis and they have diagnosed him with ringworm. We treated the area with Lotrimin and the condition did not go away. The area is not red, simply raised bumpy skin in a circular form. It has not spread to anyone else. With time (2-3 months) the condition simply disappeared. At times it comes back in the same area for a month or two. The area does not itch or bother my son at all. I was simply curious as to what it might be.

When ringworm is treated with an appropriate antifungal medication, such as Lotrimin, improvement is usually seen within 7 to 10 days. Treat it for at least one week following the clearing of the rash to make sure that all of the fungus is gone. If the condition does not go away with 4 weeks of treatment, then it was probably not ringworm in the first place.

Many other skin conditions look similar enough to ringworm for the diagnosis to be commonly confused.

Granuloma annulare is a common skin condition with raised, flesh-colored bumps that appear in a ring. It may occur on any part of the body (though most commonly on the sides or backs of the hands or feet). The bumps may be red at the beginning, but this disappears as the ring forms. There is no itching or scaling. The rings vary in size from about 1/4 inch to 2 inches in diameter.

No one knows for certain what causes granuloma annulare. It is not an infection. I believe it is probably a slow hypersensitivity reaction that some individuals develop to different types of minor trauma. It may, however, be related somehow to diabetes. Most children with granuloma annulare are healthy and don't go on to develop diabetes, but diabetes does occur more commonly in people who form these rings than in those who don't.

Granuloma annulare usually disappears spontaneously within several months of appearing (though it can take years). In almost half of cases the ring comes back for a while, usually at the original site. Sometimes localized lesions may respond to topical steroid ointments. Some physicians recommend treating this condition with steroid injections, or even stronger medications. Since the ring is usually not bothersome, and usually disappears on its own, I do not routinely recommend treatment. Often these rings will disappear following a small injection of sterile saline, so if treatment is chosen, I would consider this simple, safe method.

Nummular eczema is another common skin condition that is often mistaken for ringworm. This is a coin-shaped patch of dry, scaly skin. Itching is variable. Nummular eczema is aggravated by bathing, soaps, and irritants such as wool. Treatment involves limited bathing, generous use of alcohol-free moisturizers, and topical steroid creams. This can keep the patch under control, but it is not unusual for the condition to flare up again at the original site.

Occasionally patches of nummular eczema disappear when someone is taking an antibiotic for some other reason. Bacteria can invade the skin in these dry, scaly areas. If a patch of nummular eczema is stubborn, try treating with an antibiotic ointment.

Other conditions that occasionally look like ringworm include seborrhea, psoriasis, pityriasis, contact dermatitis (such as poison oak), drug reactions, tinea versicolor, vitiligo, erythema migrans (a rash seen in Lyme disease), and even lupus.