External hemorrhoids may cause anal eczema, constipation, anemia, perianal infection or abscess and other hazards. 1. Anal eczema: As the hemorrhoidal core of external hemorrhoids is outside the anal opening, it will lead to increased secretion or improper cleaning, causing anal itching and even anal eczema. 2. constipation: external hemorrhoids in defecation will lead to anal pain, due to too much pain, many patients will be forced not to defecate, which is easy to form a vicious circle caused by constipation. 3. anemia: some patients may have rupture and ulceration of external hemorrhoids, resulting in bleeding hemorrhoids, long-term or repeated bleeding may cause chronic anemia. 4. perianal infection or abscess: some patients with external hemorrhoids because of scraping is not easy to heal, hemorrhoidal nuclei repeatedly rupture, erosion, stimulate the anus repeatedly inflammation occurs, perianal infection or abscess symptoms are more likely to occur. It is recommended that patients pay more attention to personal hygiene, perianal adverse reactions, need to go to the hospital in a timely manner to avoid delays in treatment, resulting in aggravation of the condition.