Perianal abscess has no pain and hard lumps, may be inflammatory masses or nodules formed by local tissue proliferation. Perianal abscess is an abscess formed by acute purulent infection that occurs after the tissues around the rectum and anal canal are attacked by pathogens, and common pathogens include Escherichia coli and Staphylococcus aureus. The lesion may appear red, swollen, distended and painful, accompanied by hard nodules. After the disease is gradually controlled, the redness, swelling, swelling and pain can be gradually relieved, and the hard nodules caused by the local inflammatory reaction can be left behind, which can be gradually dissipated after the inflammation is absorbed. It is also possible that after the abscess has broken down, the local scar tissue proliferates and forms a lump. The above are some of the possible causes, we suggest that the patient should consult a doctor in time, and be examined by a professional doctor for a clear diagnosis and guidance for further treatment.