Bumps after circumcision may be caused by scarring, allergic reactions or surgical suture errors. 1. Scarring: If you are a keloid patient, compared to the insignificant scarring formed after circumcision in the normal group, a large amount of scarring will be formed after surgery in keloid patients. 2. Allergic reaction: some patients will have an allergic reaction to the suture, which is mainly manifested as redness and swelling at the suture site and the formation of bumps. 3. Surgical suture error: it may be caused by surgical suture error, the two edges of the skin are not aligned during the surgical suture, after the suture will form a lump that protrudes out of the skin, and when it is serious, it needs to be removed again by surgery. The above symptoms may also be caused by other factors, and it is recommended that the patient go to the regular hospital in time for consultation and treatment. After circumcision, patients should maintain a good diet, eat a light diet, eat more fresh fruits and vegetables. Life and work should be regular, ensure proper rest, avoid staying up late and other bad habits. If you feel unwell, you should go to a regular hospital in time to avoid delaying your condition or triggering adverse reactions.