Tinea cruris is the scientific name for fungal infection of the
groin region.It causes itching or a burning sensation
in the
groin area, thigh skin folds, or anus.
Affected areas may appear red, tan, or brown, with flaking, peeling, or cracking skin.Tinea cruris is best treated with antifungal drugs applied topically. Traditionally creams containing tolnaftate, clotrimazole or miconazole have been used, although newer agents such as butenafine are also used.
ref:http://en.wikipedia.