External hemorrhoids are mainly divided into varicose external hemorrhoids, thrombosed external hemorrhoids, inflammatory external hemorrhoids, connective tissue external hemorrhoids 4 categories. 1. Varicose external hemorrhoids: generally manifested as a round or oval soft mass on the anal verge. Patients generally have no obvious discomfort symptoms. 2. thrombosed external hemorrhoids: mostly due to rectal and anal blood vessels, pressure, trauma and other stimuli to form a thrombus, affecting blood circulation, and then the formation of external hemorrhoids. Patients are often accompanied by severe pain. 3. Inflammatory external hemorrhoids: mostly due to anal margin skin damage, local bacterial infection leads to inflammation and edema. Patients often have anal redness, swelling and pain, blood in the stool and other uncomfortable symptoms. 4. connective tissue external hemorrhoids: mostly due to the anal margin skin thickening hypertrophy hyperplasia formation, irregular shape, touch soft, no pain. It is recommended that patients with perianal discomfort should go to the hospital in a timely manner, a clear diagnosis, give targeted treatment.