A hard swelling at the anus, such as the following possibilities: 1. If there is a hard node with significant pain, it may be a small perianal abscess, the formation of thrombosed external hemorrhoids, sebaceous cysts near the anus and infection. 2. A painless small hard node without rupture, it may be a sebaceous cyst without co-infection, a large tension embedded internal hemorrhoid, external hemorrhoid, anal fistula, because of inflammation resulting in swelling of the surrounding tissue and the formation of the external opening 3, hard bumps around the anus, can not determine what specifically, the appearance of this situation to the regular hospital outpatient anorectal surgery, to carry out physical examination of the anus, anal finger diagnosis, anoscopy, to clarify the specific causes of symptomatic treatment. 4, if it is a perianal abscess, to carry out incision and drainage surgery. 5, if it is an anal fistula, excision surgery. 6, if it is hemorrhoids, consider sitz bath, hemorrhoids If it is an anal fistula, excision surgery. 6. If it does not relieve, further surgical treatment is required.