Age: 38 years old Occupation: Manager Patient self-reported symptoms: I had a perianal abscess when I was 30 years old, but I did not pay attention to it at that time 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 was afraid of the pain of surgery and did not dare to go back to the hospital, but only took medication 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 City Hospital