my son showed me what appeared to be a small burn mark on his hand last night. it is perfectly round, and when he woke up this morning there were three or more. we went to urgent care, however the doctor couldnt tell us what it is. it doesnt itch him, its not raised, flakey, or bumpy, it looks raw and burns him a bit. he said he hasnt burnt his self recently. how do i figure out what this is?