Hard lumps behind the anus, and the phenomenon of pressure pain, mainly due to hemorrhoids, as well as perianal abscess and other causes. The most common cause is hemorrhoids, hemorrhoids will be formed around the anus venous blood clusters or thrombosis, especially thrombosed external hemorrhoids, the formation of lumps wrapped in the skin, the appearance of the texture of the hard, and obvious pain symptoms and swelling, the situation is serious, but also to the impact of defecation, resulting in the phenomenon of patients with blood in the stool. Perianal abscesses can also form hard lumps around the anus and cause painful pressure. Perianal abscesses occur when an infection of the anal glands spreads to the skin around the anus. In most cases, a special fistula is formed between the perianal skin and the rectum, which causes pus to leak out of the area, leading to significant redness, swelling and pain around the anus. In addition to these causes, tumors at the end of the rectum can also cause the lesion.