The external anus is generally due to external hemorrhoids, anal dermatomes, sebaceous cysts and other diseases, the symptoms are often manifested in the anus around the soybean-like swelling, lumps or masses, and accompanied by pain, itching symptoms. 1. external hemorrhoids: the anus outside the pimples may be caused by external hemorrhoids, the symptoms are often manifested as anal swelling, itching, pain, bleeding, etc., and can be touched around the anus to appear soybean-shaped swelling, and accompanied by obvious pressure and pain. 2. Anal dermatomes: anal skin lumps may be caused by anal dermatomes, the symptoms are often manifested as lumps or nodules around the anus, and accompanied by a foreign body sensation, swelling and pain, and later the swelling may increase. 3. Sebaceous cysts: the anal growth of lumps may be caused by sebaceous cysts, the symptoms are often manifested as perianal lumps, and accompanied by moisture, redness, swelling, pressure and pain. It is recommended that patients should go to the hospital in time to find out the cause of the disease, a clear diagnosis, and give relevant treatment to avoid delaying the condition of their own blind medication.