Tinea cruris is a fungal infection that affects the groin area of the body. It is also known as jock itch, which is a common name used to describe the condition. Other synonyms for the term tinea cruris include fungal groin infection, epidermophytosis inguinalis, and dermatophytosis cruris. These terms are used interchangeably to describe the same condition, which is caused by a group of fungi known as dermatophytes. Symptoms of tinea cruris include itching, redness, and irritation in the groin area. It is usually treated with antifungal medications, either topical or oral, depending on the severity of the infection.