Patients with itchy buttocks after a bowel movement may, first, have anal itching after a bowel movement caused by hemorrhoids or sinusitis. Secondly, it may be caused by the existence of perianal eczema itself, and itching may occur after stool due to the stimulation of the skin at the anus by stool. In this case, the patient should use light salt water or potassium permanganate water to rinse the anus after the stool to keep it clean and hygienic. The itching may occur after the skin at the anus is stimulated by the stool and intestinal fluid. Such patients have strong anal hair and the skin at the anus is sensitive, so local injections of anal skin, such as lidocaine and methylene blue, can be given to relieve the itching symptoms. In normal life, you can take gentamicin solution or Chinese medicine enema treatment, with potassium permanganate solution sitz bath, regular life, light diet, eat more vegetables and fruits, avoid the stimulation of tobacco and alcohol.