Tinea cruris

Alternative names:

fungal infection of the groin; infection - fungal (groin); itching in the groin (males); jock itch; tinea of the groin

Definition:

An infection of the groin area with mold-like fungi called dermatophytes.

Causes, incidence, and risk factors:

Occasionally, itching in the groin can result from chemical irritation (see vaginal itching). Other causes include lichen simplex chronicus, eczema, and pubic lice.

Jock itch (tinea cruris) is a common skin disorder that occurs almost exclusively in adult men. It can sometimes accompany athlete's foot (tinea pedis) and other tinea infections. The fungi that cause tinea infections, such as jock itch, thrive in warm, moist areas. Susceptibility to tinea infection is increased by friction, poor hygiene, prolonged moist skin, and minor skin or nail injuries.

Most cases of itching in the groin in males is caused by tinea cruris or similar fungal infections. The body normally hosts a variety of microorganisms, including bacteria, mold-like fungi (dermatophytes) and yeast-like fungi (such as Candida). Some of these are useful to the body. Others can multiply rapidly and form infections. Fungal infections are caused by microscopic plants (fungi) that can live on the dead tissues of the hair, nails, and outer skin layers.

Tinea infections are contagious and can be passed from direct contact or contact with items such as clothing. Jock itch is usually contained to the groin and usually does not involve the scrotum or penis. It is generally less severe than other tinea infections, but may be persistent. Jock itch may be a cause of intractable pruritus ani (anal itching and discomfort).