My doctor thinks that it is not ringworm, but seborrhaic dermatitis. He examined my scalp and what was left of the rash. My skin has always been really dry, esp. in winter, and I thought I just had a dry scalp. He thinks the rash is related to the dermatitis because this condition can cause redness. He prescribed Nizoral 2%. I'm not convinced I have dermatitis because my skin all over is dry and gets worse in cold weather (dermatitis is caused by a fungus). It could be a combo, I guess. Hopefully, the Nizoral will work for my scalp and prevent any future red rashes.