Patients appear hard around a circle of the anal opening for the following reasons: a. Inflammatory lesions: Consider the possibility of inflammatory lesions of the rectum and anal canal, inflammation infiltration will lead to a series of symptoms such as local redness, swelling, hardness and pain. Two, ring-shaped hemorrhoids: most of this kind of hemorrhoids are more common in mixed hemorrhoids, due to the formation of hemorrhoids nucleus prolapsed outside the anal opening, may form thrombosed external hemorrhoids when it will be localized as a hard lump, and even appear obvious severe pain. Third, other causes: such as anal stenosis, caused by localized fibrosis around the anus, which is relatively rare, but can affect the patient’s bowel movement, causing a series of symptoms such as thinning of the bowel movement, difficulty in defecation and constipation.