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It is not possible for us to make a definite diagnosis without examining you and actually seeing your rash. However, there is a common superficial fungal infection, seen mostly in adolescents and young adults, which sounds very much like what you describe. It is called Tinea versicolor and is caused by a fungus called Pityrosporum orbiculare (formerly called Malassezia furfur). This fungus causes a superficial, patchy infection of the skin, usually on the shoulders, neck and upper arms. It produces lesions that can be hypopigmented (light) or hyperpigmented (dark). It is not a serious infection but it can be chronic. During the summer, the lesions become lighter than the surrounding skin that tans, and during the winter the lesions look relatively darker than the rest of the skin; hence the name Tinea versicolor (“varying-colored fungus”). The fungus may suppress the formation of melanin that is responsible for skin pigmentation.
There are several ways to treat this infection. One that is relatively inexpensive is to apply a lotion containing 1% or 2.5% selenium sulfide overnight once a week for a month. The former is available without a prescription as Selsun® shampoo for dandruff. However you should see your pediatrician and get an accurate diagnosis before starting any treatment.
You're not alone. Take a look at a few of the quetions related to this topic that other teens have asked us.
During the summer, I get red dots on my arms. Is there anything I can do about it?
During the summer I get huge red sores on my legs. What's wrong with me?
I have small, red dots on my torso. Could this be a food allergy?
Posted 6-15-01
Do you have a question?  As a reminder, this information should not be relied on as medical advice and is not intended to replace the advice of your doctor. Please read our full  .
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