The anus can be seen purulent discharge, it has many reasons, should be timely to the hospital, and then rectal fingerprinting, if necessary, can be performed anoscopy clear diagnosis.1, more common is perianal abscess, anal gland infection is easy to spread along the anus, rectum to the surrounding area, resulting in pus secretion in the anus localized, the abscess will lead to itchy anus mouth, you can perform a perianal ultrasound to clarify the diagnosis. 2, The common cause of pus discharge from the anus may be feces, such as elderly patients with anal sphincter relaxation, during defecation, feces can easily lead to staining of the skin around the anus, the local stimulation and thus cause itching. 3, the common cause of pus discharge from the anus may be perianal eczema, for example, after the fungal infection can easily lead to the perianal radioactive chaffing, the local inflammatory exudate can be seen, which can lead to pain and itching in perianal area. Itchy. So there is purulent discharge in the perianal area, and it has many reasons.