discolored skin spots

My 15 year old son has discolored skin spots on his neck & arms. The spots are lighter color than his natural skin color. When it is hot he seems to get more. On his arms he also gets little red bumps. What could this be? Is there any over-the-counters that would treat this?

[Bhupinder Kaur, MD]

Hello,
Without examination, confirmation of a diagnosis is tough but it can be pityriasis versicolor or pityriasis alba. Pityriasis versicolor is caused by an overgrowth of a yeast fungus and are found mainly on sun exposed areas. Pityriasis alba is a common hypopigmented dermatitis.This is a self-limited disorder that usually resolves by adulthood. Severe cases may benefit by Psoralen plus ultraviolet light A photochemotherapy (PUVA).

I sincerely suggest you to get it examined from a dermatologist to confirm the diagnosis. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.