Not sure exactly, but it certainly is not related to
Accutane, so you needn't worry about that. It's probably just dry skin, though it may be a condition called acanthosis nigricans, which in your age group is often
familialFamilial tremor. Show a doctor next time you go. There may be
littleLittle noses decongestant
Little tummys you can do, but at least you won't worry once you know for sure what it is.
Best.
Dr. Rockoff