what is jock itch
Jock itch. Jock itch is a fungal infection of the groin. It is known medically as tinea cruris and is a common skin infection caused by a type of fungus called tinea.The fungus thrives in warm, moist areas of the body and, as a result, infection can affect the genitals, inner thighs and buttocks.ock itch is a fungal infection of the groin. It is known medically as tinea cruris and is a common skin infection caused by a type of fungus called tinea.