Perianal abscess for 4 years, there has been a hard lump of possible causes are local scar proliferation formation of lumps, inflammatory masses, etc., need to be diagnosed and treated as soon as possible. 1. local scarring: perianal abscess due to repeated episodes of inflammation of the anal sinus, repeated episodes of inflammation will lead to fibroplasia, a large number of connective tissue proliferation, degeneration, accompanied by itching, pain when touching and other clinical manifestations, connective tissue hyperplasia will form a hard, small mobility of the hard mass. 2. residual inflammatory mass: perianal abscess occurs in the anus, anal canal and rectum around, is an acute suppurative infectious disease, pus can not be discharged in time to form an inflammatory mass. Perianal abscess hard lumps exist for a long time, you need to consult a doctor in a timely manner, improve the relevant examination, under the guidance of the doctor to clarify the diagnosis, active treatment, to avoid the deterioration of the condition.