Inclusion Criteria:  Patient whose age ≥ 18 years Patient who visited between January 1, 2019 and December 31, 2019 for an anal or perianal abscess Patient who had a skin incision of a first anal margin or buttock abscess and/or whose fistula was not found during examination under anesthesia in the operating room French speaking patient  Exclusion Criteria:  Patient with pilonidal abscess Patient with an intramural abscess Patient with a history of anal margin or buttock abscess and/or anal fistula Patient with a history of proctologic surgery Patient with an abscess whose skin incision under local anesthesia has failed Patient under guardianship or curatorship Patient deprived of liberty Patient under court protection Patient objecting to the use of his or her data for this research