Tinea Cruris Infection on Darker Skin: Epidemiology and Etiology

00:01 Moving on now talking about tinea cruris or what we call jock itch.

00:07 So what is tinea cruris? It's a dermatophyte infection involving the crural fold groin that is over the groin area. Again, the most common cause is T rubrum.

00:21 And then you've got other frequent causes as listed.

00:26 It commonly spreads from tinea pedis or from the feet, or from onychomycosis, which is nail involvement by dermatophyte infection. Scratching or use of contaminated towels or bedsheets is thought to also trigger spread of the infection to the inguinal area.

00:50 It affects all genders, but is more prevalent in males at a ratio of 3 to 1. Tinea cruris may present with erythematous or hypopigmented patch on the thigh that spreads centrifugally, and of course, in skin of color patients, one m ay not appreciate the red or inflamed border. One may also get partial central clearing and a slightly elevated distinct border. It starts on one side, but it can spread and become bilateral.

01:28 So the differential diagnosis could be Candida intertrigo, invest psoriasis, seborrheic dermatitis, and erythrasma.