Mr. Xiao, age: 38 years old, patient reported symptoms: when he was 30 years old, he suffered from perianal abscess, but at that time he did not pay attention to it and simply took anti-inflammatory drugs for a few days. Later, the anus slowly began to ulcerate and flow pus. Two years ago, Mr. Xiao felt that his anus was swollen and moist again, and it was very painful every time he had a bowel movement. Later, the swollen perianal area began to ulcerate, and pus kept flowing. Mr. Xiao had the pain of the last surgery and did not dare to go to the hospital, but only took medicine and injections in the outpatient clinic. Usually do not dare to sit, sleep can only lie on their stomachs, but also always pollute the bed sheets. Every time you go to the toilet is like a torture. Xu Jianyong, Department of Anorectal Medicine, Nantong Hospital of Traditional Chinese Medicine