Hard bumps next to the anus may be caused by sebaceous cysts, warts, and perianal abscesses. 1. Sebaceous cysts: If the sebum secreted by the sebaceous glands next to the anus is blocked in the glands, hard bumps may form next to the anus. 2. Condyloma acuminatum: If the skin next to the anus is infected with human papilloma virus, it can cause wart-like growths to appear on the skin, which can be manifested as hard bumps, and the more they grow, the bigger and bigger they are, and they need to be treated as soon as possible. 3. Perianal abscess: If the perianal tissues are infected by bacteria and other pathogens, skin redness, swelling, pressure and pain, and sometimes hard lumps can be touched, which may be accompanied by fever, fatigue and other systemic symptoms. It is recommended that people with hard lumps next to the anus go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor to avoid delaying the condition.