Patients who feel a ball of flesh outside the anus without pain may be caused by external hemorrhoids, rectal polyps, acromegaly and other diseases. 1. external hemorrhoids: external hemorrhoids are usually located below the dentate line, is formed by the perianal skin and subcutaneous connective tissue inflammatory hyperplasia, venous dilatation or thrombus stagnation of the mass, for the connective tissue external hemorrhoids and varicose external hemorrhoids may not have symptoms of pain. 2. Rectal polyps: for some patients with low polyps detached from the anus outside the rectal polyps, there may be a ball of meat protruding from the anus without pain, a small number of patients can appear blood in the stool, the anxious and heavy (lower abdomen uncomfortable, very want to relieve the stool, after the defecation of a sense of incompletion) and other symptoms. 3. acromegaly: acromegaly, also known as anogenital warts, is a common sexually transmitted disease caused by human papillomavirus infection, mainly manifested as papules, keratinized plaques, papillae or cauliflower-like redundancy, etc., the emergence of the anus outside the touch of the meatball painless situation, may be caused by acromegaly. In addition, anal papillae hypertrophy, sebaceous cysts and other diseases may also cause such symptoms, it is recommended that the patient timely medical examination, clear cause for targeted treatment.