Itchy buttocks may be caused by eczema, folliculitis, urticaria and other reasons. 1. Eczema: Eczema is related to a variety of internal and external factors, such as contact with allergens, infections, endocrine changes, living environment, etc. can induce eczema, resulting in the phenomenon of itchy buttocks. 2. Folliculitis: folliculitis is related to infection, mainly caused by Staphylococcus aureus infection, decreased immunity, high-temperature environment, skin injuries and poor personal skin hygiene may trigger folliculitis, the phenomenon of itchy buttocks. 3. Urticaria: more causes, may be related to food, drugs, environment, physical stimulation. It can also lead to the symptoms of itchy buttocks skin. There are many other reasons for itchy buttocks, patients need to consult a doctor in a timely manner, after a clear diagnosis, follow the doctor’s instructions to avoid aggravation of the condition.