This could be tinea versicolor which is a common fungal infection that often affects adolescents and sometimes in children. The term versicolor refers to the fact that it causes the affected skin to change color and become either lighter or darker than surrounding skin. The most common areas it affects are the shoulders, back, and chest. The face is usually spared, although sometimes children can get it there.
Factors that can cause the fungus to become more visible include high humidity and immune or hormone abnormalities. The rash of tinea versicolor tends to linger even after successful treatment, especially if the spots are lighter than surrounding skin. Diagnosis is usually through microscope analysis of the skin scrapings. If it persists, it is best to see your doctor for further evaluation and management.
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