A dermatophytosis that is commonly caused by Trichophyton rubrum or T. mentagrophytes.
Commonly referred to as Jock Itch.
Risk factors are associated with a moist environment as seen in warm weather, wet and restrictive clothing, and obesity causing constant approximarption of skinfolds.
Men are affected more than women due to the proximity of the scrotum and thigh.
Differential diagnosis of tinea cruris includes:
Contact dermatitis
Psoriasis
Erythrasma
Candidiasis
Scrotal involvement is usually minimal or absent.
If appearance is not diagnostic, a potassium hydroxide wet mount is helpful to establish the presence of fungal elements.
Topical antifungal choices include terbinafine, miconazole, clotrimazole, ketoconazole, econazole, naftifine, and ciclopirox applied bid for 10 to 14 days.
Itraconazole 200 mg po once/day or terbinafine 250 mg po once/day for 3 to 6 wk may be needed in patients who have refractory, inflammatory, or widespread infections.