Dampness in the groin with a foul odor may be ringworm, infection, and in the case of male patients it may be scrotal eczema. 1. Ringworm: ringworm often occurs in the groin, perianal, with a certain degree of contagious, will cause groin moisture, itching skin, rash, odor. These patients can be treated with terbinafine ointment and ketoconazole ointment under the guidance of a doctor. 2. Infection: There are a large number of sweat glands in the groin, which can easily breed bacteria after sweating, and the bacteria fermentation causes odor. This kind of patients can use potassium permanganate solution for local cleaning, and then apply erythromycin for treatment. 3. Scrotal eczema: male patients with scrotal eczema will lead to groin moisture, bad smell, while scrotal swelling, scrotal skin redness, itching, vesicles, etc., you can take benzylamine hydrochloride tablets, loratadine tablets, and apply furacillin for treatment on medical advice.