Tinea cruris (TC), also known as jock itch, is a common type of contagious, superficial fungal infection of the groin and buttocks region, which occurs predominantly but not exclusively in men and in hot-humid climates.

[3][4] Typically, over the upper inner thighs, there is an intensely itchy red raised rash with a scaly well-defined curved border.

[4] Its appearance may be similar to some other rashes that occur in skin folds including candidal intertrigo, erythrasma, inverse psoriasis and seborrhoeic dermatitis.

[3][5] The type of fungus involved may vary in different parts of the world; for example, Trichophyton rubrum and Epidermophyton floccosum are common in New Zealand.

[3] Its appearance may be similar to some other rashes that occur in skin folds including candidal intertrigo, erythrasma, inverse psoriasis and seborrhoeic dermatitis.

[7] To prevent recurrences of tinea cruris, concurrent fungal infections such as athlete's foot need to be treated.

[5] Tinea cruris is treated by applying antifungal medications of the allylamine or azole type to the groin region.

Studies suggest that allylamines (naftifine and terbinafine) are a quicker but more expensive form of treatment compared to azoles (clotrimazole, econazole, ketoconazole, oxiconazole, miconazole, sulconazole).