The following factors are considered for anal odor: First, consider that the patient is an elderly person or a young child when the anal sphincter is not fully developed or relaxed, there will be rectal mucus or fecal leakage from the anus. Second, consider rectal diseases, common diseases that cause discharge are anal fistula and perianal abscess, both of which have a large amount of purulent discharge from the fistula and abscess when the epidermis is broken, and this kind of discharge has a large number of various bacteria, so it tastes foul. deep into the subcutaneous. Unscientific treatment and care as well as unhygienic environment will easily lead to rotting flesh, which will have bad odor after oxidation.