I aplogize, but I have little to say. Your description doesn't sound as though you have something serious, but it doesn't remind me of anything either. Perhaps the biopsy will be helpful, if only to rule out something you need to pay attention to. Sometimes the best approach with nodescript rashes is to ignore them (once significant conditions have been ruled out.)
Best.
Dr. Rockoff
Diagnosis "Superficial and deep lymphocyte mediated perivascular dermatitis with spongiosis and focal interface changes."
Comment "This is a nonspecific pattern of injury that can be seen with an allergic contact dermatitis as well as mucha-habermann disease."
My spots have gotten significatly better since the derm. put me on predisone for 10 days. They are almost gone. I don't have to wear turtlenecks anymore, just no 3/4 length sleeves quite yet, but I am improving greatly!