外痔位于直肠齿状线以下，为肛门皮肤所覆盖，是直肠下静脉丛曲张所致，常因排便反复破裂出血则变成硬结，血块吸收后形成纤维性皮赘。由于粪便和分泌物潴留的刺激，不易保持清洁，经常引起局部皮肤搔痒，以致发生肛周皮炎，因此病人往往急切要求治疗．传统的外科手术方法是用 External hemorrhoids located below the rectal dentate line, covered by the anus skin, is caused by varicose veins under the rectum, often due to repeated rupture of the bowel becomes hardened knot, the formation of fibrous clitoral absorption of blood clots. Due to the irritation of retention of excrement and secretions, it is not easy to keep clean and often cause local skin itching, resulting in perianal dermatitis. Therefore, patients often urgently require treatment. Traditional surgical methods are used