Symptoms:

• Itching in groin, thigh skin folds, or anus
• Red, raised, scaly patches that may blister and ooze -- The patches often have sharply-defined edges and are often redder around the outside with normal skin tone in the center
• Abnormally dark or light skin

Signs and tests:

Your doctor will usually diagnose jock itch based on the appearance of the skin. Tests are usually not necessary. If tests are needed to confirm the diagnosis, either a culture or a skin lesion biopsy (for example, a scraping of the skin) may show the fungus that causes jock itch.