I think i have both tinea corporis and eczema, how can i tell which is which...how i can treat it?

Skin rash: Tinea corporis may be acute (sudden onset and rapid spread) or chronic (slow extension of a mild, barely inflamed, rash). It usually affects exposed areas but may also spread from other infected sites. There are many different types of eczema that produce symptoms and signs ranging from oozing blisters to crusty plaques of skin. I recommend seeing a Physician.

See: A doctor or a Dermatologist. Tinea corporis is treated with antifungal topical while Eczema is treated with topical steroids