My son is in his late teens and has many small, circular spots on his chest, back and inside arms. Mostly flat, some a very tiny bit raised. Each spot is about half the size of a dime, some smaller, some almost as large as a dime - mostly perfectly round, some a bit more irregular. They perhaps itch a tiny bit occasionally, but for the most part don't itch at all. He is light skinned and the spots are very light pink to tan. He tells me he has had this off and on inside his arm for six months, but now it is covering his trunk. He's refusing to go to a doctor and says it will go away again - and the spots inside his arm have already disappeared again (but he's had it for a couple weeks this time, all over his body...) I have studied every kind of round/circular rash - and looked at photos. Everything looks more irregular and/or more inflamed than this. It's barely visible, and the shape is extremely regular - circular - like ringworm, but it is not more red on the outside than inside - the spots are uniformly colored. Nothing on his neck or face whatsoever. Thank you for your help.