If the itchy buttocks is a localized itching of the skin due to prolonged sitting and lack of ventilation, it is important to pay attention to whether there is any occurrence of allergies or symptoms of eczema. If the local scratching, serious, you can first use antihistamines cetirizine. If it is anal itching, it may be caused by hemorrhoids, usually pay attention to eat some light and easy to digest food, develop good eating habits, do not eat some cold, spicy, stimulating food, drink more boiled water.