The difference between Tinea pedis and Tinea cruris is that pedis occurs on the foot while cruris occure on the groin and the similarity is that they are both fugal infection. :)
Doctor Sofen, a dermatologist in Los Angeles wrote this:Other Treatment Tea tree oil, found in health food stores, can be applied to the feet to treat athlete's foot. Tea tree oil is an antifungal...
Uncomplicated tinea cruris (jock itch) is effectively treated with topical anti-fungal creams. They are available as OTC preparations. See link for more.