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Tinea cruris on the groin
Tinea cruris, also known as crotch itch, crotch rot, Dhobie 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 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. It 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 tinia. However, candidal infections tend to both appear and disappear with treatment more quickly.:309 It may also affect the scrotum.
Symptoms and signs
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.
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 with no particular pattern. The rash appears as raised red plaques (platelike areas) and scaly patches with sharply defined borders that may blister and ooze.
If the rash advances, it usually advances down the thigh. The advancing edge is redder and more raised than areas that have been infected longer. The advancing edge is usually scaly, and very easily distinguished or well demarcated.
The skin within the border turns a reddish-brown and loses much of its scale. The border may exhibit tiny pimples or even pustules, with central areas that are reddish and dry with small scales.
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.
Tinea cruris is best treated with topical antifungal medications of the allylamine or azole type. These anti-fungal agents stop fungi from producing ergosterol, an essential component of fungal cell membranes. If ergosterol synthesis is completely or partially inhibited, the fungal cell is unable to construct an intact cell membrane, and dies. Allylamines and thiocarbamate antifungals (tolnaftate, Tinactin etc.) are effective against tinea cruris, but not against Candida albicans, which requires an azole type drug, making azole drugs, effective against both types of infections, the first choice for topical treatment of infections of unknown etiology in intertriginous areas.
If the skin inflammation causes discomfort and itching, glucocorticoid steroids (such as 1% hydrocortisone cream) may be combined with the anti-fungal drug to help prevent further irritation due to the patient scratching the area. Apart from the quicker relief of symptoms, this also helps minimize the risk of secondary bacterial infection caused by the scratching. However, steroids may exacerbate the condition if used alone for fungal infections because they hinder the body's immune system.
Since fungi tend to thrive in warm, dark, damp conditions, minimizing these conditions can help treat and prevent this rash. Some useful measures are: wearing boxer underwear or no underwear, increasing air-flow by sleeping near a fan, wearing loose sleepwear or no sleepwear, exposing the area to wind and sun, and thoroughly cleaning the area with a hand-held showerhead and soap.
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