External hemorrhoids are primarily manifested as one or more perianal swellings, dermatomes, which may be soft or may be hardened and painful. External hemorrhoids are caused by pathologic dilatation or connective tissue proliferation of the subcutaneous venous plexus below the dentate line. External hemorrhoids can be divided into connective tissue external hemorrhoids, inflammatory external hemorrhoids and thrombosed external hemorrhoids. Connective tissue external hemorrhoids are mainly manifested in the anal verge of one or more of the size of the skin, oval raised swelling, generally soft, can not also be incorporated into the anus. Inflammatory external hemorrhoids are mainly caused by hemorrhoidal infection, manifested as hardening of the perianal swelling, accompanied by a painful feeling or anal drop sensation. Thrombosed external hemorrhoids refers to the varicose subcutaneous venous plexus has acute thrombosis, can be accompanied by severe anal pain, perianal swelling more soft, individual thrombosed external hemorrhoids is hard, more dark purple-red. The diagnosis of external hemorrhoids in addition to anal visual diagnosis, but also need to carry out anorectal fingerprinting, etc. It is recommended that people suffering from hemorrhoids timely consultation, follow the doctor’s instructions for examination and treatment.