Tinea cruris on the groin
|Classification and external resources|
Tinea cruris, also known as crotch itch, crotch rot, Dhobi itch, eczema marginatum, gym itch, jock itch, jock rot, scrot rot and ringworm of the groin:303 is a dermatophyte fungal infection of the groin region in any sex, though more often seen in males. In the German sprachraum this condition is called tinea inguinalis (from Latin inguen = groin) whereas tinea cruris is used there for a dermatophytosis of the lower leg (Latin crus).
Tinea cruris is similar to, but different from Candidal intertrigo, which is an infection of the skin by Candida albicans. The latter is more specifically located between intertriginous folds of adjacent skin, which can be present in the groin or scrotum, and be indistinguishable from fungal infections caused by tinea. However, candidal infections tend to both appear and with treatment disappear more quickly.:309 It may also affect the scrotum.
Signs and symptoms
As the common name for this condition implies, it causes itching or a burning sensation in the groin area, thigh skin folds, or anus. It may involve the inner thighs and genital areas, as well as extending back to the perineum and perianal areas.
Tinea is often painful or itchy, but not in every case. There are visual clues to help identify a fungal infection. These include:
- Inflammation of the groin, anal area, and upper thigh - not including the genitals themselves
- slightly raised patch
- sharp borders
- expanding or spreading, with clearing in the center
- dry or scaly blisters (occasionally oozing or crusting)
- abnormally dark or light skin
- skin redness or inflammation
Fungal infections often spread out in a circle, leaving normal-looking skin in the middle. At the leading edge of the infection the skin is raised, red, and scaly.
Affected areas may appear red, tan, or brown, with flaking, rippling, peeling, or cracking skin.
The acute infection begins with an area in the groin fold about a half-inch across, usually on both sides. The area may enlarge, and other sores may develop. The rash has sharply defined borders that may blister and ooze.
Opportunistic infections (infections that are caused by a diminished immune system) are frequent. Fungus from an athlete's foot infection can spread to the groin through clothing. Tight, restrictive clothing, such as jockstraps, traps heat and moisture, providing an ideal environment for the fungus.
Medical professionals suggest keeping the groin area clean and dry by drying off thoroughly after bathing and putting on dry clothing right away after swimming or perspiring.
Other recommendations are: not sharing clothing or towels with others, showering immediately after athletic activities, wearing loose cotton underwear, avoiding tight-fitting clothes, and using antifungal powders.
The benefits of the use of topical steroids in addition to an antifungal is unclear. There might be a greater cure rate but no guidelines currently recommend its addition. The effect of Whitfield's ointment is also unclear.
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