Jock itch (tinea cruris)

[Mark Zuckerberg]

Jock itch is a dermatophyte (fungal) infection of the groin.

Symptoms of tinea cruris include an itchy rash that may be painful.
Doctors base the diagnosis on an examination of the groin.
Treatment includes antifungal drugs applied directly to the affected areas or sometimes taken by mouth.

(See also Overview of Fungal Skin Infections.)
Tinea cruris is a type of dermatophytosis. Tinea cruris is primarily caused by Trichophyton.
This infection is much more common among men because moisture can get trapped between the scrotum and thigh. Tinea cruris develops most frequently in warm weather or when wearing wet and tight clothing. People who are obese are at risk because their skinfolds trap moisture.
The infection begins in the skinfolds of the genital area and can spread to the upper inner thighs and may occur on both sides. Usually the scrotum is not affected or is only slightly affected. The rash has a scaly, pink border. Tinea cruris can be quite itchy and may be painful. This infection often recurs, particularly among people who have onychomycosis or athlete