Itchy pimples in the buttock groove can be caused by folliculitis, ringworm, eczema and other causes. Different diseases have different causes. 1. Folliculitis: associated with bacterial infections such as Staphylococcus aureus, it can lead to localized red papules and pimples in and around the hair follicles, accompanied by itching or pain. 2. Ringworm: It is a dermatophyte infection that appears in the groin, perineum and perianal area, mainly caused by Trichophyton suis, Trichophyton rubrum and Microsporum canis. Due to the poor permeability, moisture, easy to friction, so easy to secondary fungal infections, can lead to the local appearance of clear boundaries of the erythema, accompanied by pimples, pimples and other damages, often itchy situation. 3. Eczema: is due to a variety of internal and external factors caused by the superficial dermis and epidermal inflammation, may be related to chronic infection foci, food, environmental factors. Clinically, acute lesions are dominated by erythema, papules, papules, with a tendency to ooze. The chronic phase is dominated by mossy changes and is easy to recur. The appearance of itchy pimples in the fart groove, you need to seek medical attention as soon as possible to clarify the cause of the disease.