Definition of Jock itch:

Jock itch, also called tinea cruris or ringworm of the groin, is an infection of the groin area caused by fungus.

Causes, incidence, and risk factors:

Jock itch occurs when a particular type of fungus grows and spreads in the groin area.

Jock itch occurs mostly in adult men and adolescent boys. It can sometimes accompany athlete's foot and ringworm. The fungus that causes jock itch thrives in warm, moist areas.

Jock itch can be triggered by friction from clothes and prolonged wetness in the groin area, such as from sweating.

Jock itch may be contagious. It can be passed from one person to the next by direct skin-to-skin contact or contact with unwashed clothing.