External hemorrhoids well, the rest of the anus has redness, small cracks, but also itchy may be due to anal fissure, anal fistula, anal eczema and other diseases caused by the use of potassium permanganate solution, cephalexin, dinexed cream and other drugs under the guidance of a doctor for treatment. 1. Anal fissure: usually due to prolonged improper diet, mechanical trauma and other factors, resulting in the formation of small ulcers below the dentate line of the anal canal skin layer fissure, and accompanied by redness, swelling, itching and other uncomfortable symptoms. Patients can use potassium permanganate solution sitz bath, erythromycin ointment and other drugs under the guidance of the doctor for treatment. 2. Anal fistula: this disease is usually due to a history of perianal abscess, bad habits and other factors, resulting in granulomatous ducts around the anal canal or rectum. Clinical manifestations are mostly purulent, mucous secretions in the perianal area, due to the stimulation of secretions, may lead to redness and swelling, and accompanied by itching, cracking and other uncomfortable symptoms. Patients can follow the doctor’s instructions to use mupirocin ointment, cefixime and other drugs for treatment. 3. Anal eczema: It is usually an allergic non-infectious skin disease caused by a variety of factors such as improper diet and endocrine disorders. The occurrence of perianal eczema may damage the mucous membrane of the skin, leading to cracks, and accompanied by redness, swelling, itching and other uncomfortable symptoms. Patients can be treated with medications such as Denuded cream and Tacrolimus ointment as prescribed by the doctor. When patients have redness, swelling, small cracks and itching elsewhere in the anus, they should pay attention to keeping the local skin clean in their daily life to avoid infections, which may lead to aggravation of the condition.