Itchy buttocks are considered to be related to prickly heat, eczema, folliculitis, jock itch and so on. 1. Prickly heat: prickly heat is mainly caused by the blockage of sweat ducts, while high ambient temperature and prolonged bed rest are the triggers. Prickly heat is mainly manifested by the appearance of small blisters, pimples, papules, and may be accompanied by tingling or itching sensation, so some patients will be very itchy when their buttocks are hot. 2. Eczema: the cause of eczema is still unclear, may be related to contact with allergic substances, immune function abnormalities. Eczema can cause some patients to appear hot ass is very itchy phenomenon, the local skin may also appear millet size papules, papules, blisters, skin roughness and hypertrophy and other symptoms. 3. Folliculitis: folliculitis is caused by infected bacteria, patients will appear local skin red papules or white pustules on top, easy to accompany itching, tenderness, pain and other symptoms, can be manifested as itchy buttocks. 4. ringworm: ringworm can also cause some patients with hot butt is very itchy, the local skin can also be manifested as ring or semi-ring-shaped erythema, papular damage, erythema covered with scales and patients can be conscious of itching. Ringworm is mainly caused by fungal infection, infectious, can be transmitted through direct contact or indirect contact. It is recommended that the person who is very itchy when the buttocks are hot should seek medical examination and actively investigate the disease. Try to wear loose, cotton underwear and avoid sitting for a long time.