Redness, swelling and stinging pain in the perianal area after hemorrhoid surgery may be related to hematoma, inflammatory infection, perianal abscess and other conditions. 1. hematoma: due to the hemorrhoid surgery process, will cause some damage to the muscle tissue around the hemorrhoids, may lead to the emergence of local hematoma, the patient appeared local red mass, accompanied by obvious tingling sensation. With the passage of time, the lump is absorbed, the pain will gradually reduce. 2. Inflammation and infection: Because the anus is a window of excretion, and the wound after hemorrhoid surgery is an open wound, it is very likely to cause infection. Once infection occurs, it will lead to localized redness, tingling, oozing and swelling and other symptoms. 3. Perianal abscess: If an infected abscess forms under the skin, there may be obvious redness, swelling, stinging pain, and the patient can hardly sit still, which may be accompanied by fever and other symptoms, and may seriously break down and flow pus. It is recommended that patients after hemorrhoid surgery pay more attention to observation, if there are uncomfortable symptoms, you need to inform the doctor in a timely manner, timely and appropriate treatment.