A hard strip around the anus may be related to perianal diseases such as perianal abscess, anal fistula, anal fissure and hemorrhoids. 1. Perianal abscess: it is an infectious disease that occurs in the gap between the anal canal and the rectum, once the abscess is formed, it will be manifested as a hard lump around the anus, which may look like a hard strip and is accompanied by severe pain, fever and other phenomena. 2. Fistula: Perianal abscess is not controlled in time, once broken, it will form fistula. It is manifested by the appearance of hard nodules around the anus, which will lead to a series of symptoms such as purulent secretion, moisture, itching and so on in the anal area. 3. Anal fissure: If the skin around the anus is torn, anal fissure will be formed, and if the condition worsens, it will lead to the formation of strips of hard lumps on the surrounding skin. 4. Hemorrhoids: may be caused by thrombosed external hemorrhoids, may appear in the perianal region of the hard strip or hard lumps, but also accompanied by the lesion enlargement, recurrent attacks and obvious pain and other symptoms. The phenomenon of hard stripes around the anus, it is recommended that patients seek timely medical attention, under the guidance of the doctor to carry out the appropriate examination, to clarify the cause of the disease, to give targeted treatment.