The folds of the anal opening become larger and protrude, and there are small skin-colored bumps on the folds, which are not painful or itchy may be due to perianal abscess, hemorrhoids, sebaceous cysts and other causes. 1. Perianal abscess: Perianal abscess is usually caused by anal gland infection, obstruction and other factors, the perianal area may have redness, swelling, pain and other symptoms, may also appear in the anal opening folds become larger and protruding, there are small bumps of skin color on the folds, painless and itchy symptoms. 2. hemorrhoids: hemorrhoids generally refers to perianal diseases, bad habits and other factors caused by the anorectal diseases, there may be anal itching, pain and other symptoms, but also may trigger the anal opening folds become larger and protruding, folds on the skin color of the small pimples, painless and itchy symptoms, most commonly found in connective tissue external hemorrhoids. 3. Sebaceous cysts: sebaceous cysts may be caused by sebaceous gland excretory duct obstruction, acne and other reasons, may appear local redness, swelling, tenderness and other symptoms, may also have the anal folds become larger and protruding, there are skin color pimples on the folds, painless and itchy symptoms. The appearance of the above symptoms, there may be other causes, such as anal fistula, anal fibroids and other diseases, it is recommended that the patient should be timely to the hospital, differential diagnosis, follow the doctor’s instructions in the doctor’s guidance, so as not to delay the condition.