There are still hard lumps some time after perianal abscess surgery may be caused by local infection, edema hyperplasia, scar proliferation, thrombosed hemorrhoids and so on. 1. Localized infection. It may be because the infected part of the perianal abscess is not removed completely, thus a small abscess infection occurs, you need to go to the hospital, operated by a professional doctor, open the abscess to clean the pus cavity, and give fluent drainage. 2. Edema hyperplasia. Localized edema hyperplasia can also produce perianal local hardness, can take a sitz bath, hardness will gradually reduce and eventually disappear, pay attention to maintain the anal area hygiene. 3. Scarring. For keloid patients, there will often be localized scarring in the anus, alert to the formation of anal stenosis can be, without special treatment. 4. Thrombosed hemorrhoids. After surgery for perianal abscess, there may be local blood reflux abnormalities, thus causing thrombosed hemorrhoids, thrombosis aggravation, etc. It is recommended to go to the hospital as soon as possible, to clarify the cause of the disease, and then to be re-opened in time to reduce the patient’s pain. After a period of time after the operation of perianal abscess, found that there are hard lumps in the perianal area, should go to the hospital in time for examination, to clarify the cause of the disease, and follow the doctor’s instructions to give reasonable treatment, to avoid delaying the aggravation of the condition.