My boyfriend has something like sores on his legs. some of them are circles, some are shaped like "C's" they are as small as a dime and as large as a quarter.Each spot
It could be ring worm (a lot of wrestlers get it). It would be hard to tell without a picture but ringworn is circular. It is a fungus so he would need to see a doctor to get medication to kill it. Google pictures of ringworm
(itchy and last less than 24 hours),Erythema annulare centrifugum(trailing edge scale) or erythema multiforme.
I suggest you to get it evaluated from a dermatologist and get KOh examination and biopsy of the skin scrapings done.
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.