A hard pimple with pus and pain inside the anus is considered to be related to hemorrhoids, perianal abscess and other diseases, and further examination is needed to clarify the cause of the disease and give treatment. 1. hemorrhoids: generally due to hemorrhoids in the attack, there will be varicose veins around the anus, thus causing the phenomenon of a hard lump in the anus with pus and pain, and pain, bleeding, anal swelling and other symptoms, can be taken under the guidance of the doctor thrombosed external hemorrhoidal exfoliation surgery, such as surgical treatment. 2. Perianal abscess: usually due to the lack of attention to hygiene and cleanliness around the anus, resulting in perianal skin infected by pathogenic bacteria, under the stimulation of pathogenic bacteria, causing the anus to grow a hard pimple inside the pus and pain phenomenon. Perianal abscess may be out of pain and other symptoms, can be taken under the guidance of the doctor incision and drainage surgery and other surgical treatment. If there is a hard lump in the anus, there is pus inside the phenomenon of pain, may also be due to anal polyps, sebaceous cysts and other diseases caused by the complexity of the cause, it is recommended that once found in a timely manner to the hospital, a clear diagnosis to give targeted treatment.