A bulge in the perianal area is painful to press, considering perianal abscess, thrombosed external hemorrhoids, perianal folliculitis and other diseases, you can clarify the cause of the cause of treatment under the guidance of the doctor. 1. perianal abscess: perianal abscess is mainly due to purulent infection of the soft tissue or interstitial space around the anal canal and rectum, purulent exudates gathered to form an abscess, which will be manifested as a bulge in the perianal area. 2. Thrombosed external hemorrhoids: ruptured veins or blood clots appear in the perianal subcutaneous mass will be formed, the disease can be treated by surgery. 3. Perianal folliculitis: purulent inflammation that occurs when pathogenic bacteria invade the hair follicles, forming purulent masses. Due to individual differences and the diversity of causes, it is recommended to go to the hospital in time to find out the cause of the lumps in the perianal area, and actively cooperate with the doctor to receive standardized treatment.