Perianal skin cracking may be suffering from anal fissure, perianal eczema, sinusitis and other diseases. 1. Anal fissure: anal fissure is generally caused by anal canal stenosis, long-term constipation or diarrhea, infection and other factors, the patient’s anal canal skin will be a whole layer of longitudinal fissure, accompanied by periodic pain, some patients perineum, the inner thighs will also appear radiating pain, and some patients will also have blood in the stool, itching and other symptoms of the anus. 2. Perianal eczema: perianal eczema is generally caused by trauma, hemorrhoids, heredity, excessive friction, etc., patients with perianal lesions are mostly pinpoint to corn size red papules, papules, serious patients will appear small blisters, when the blisters due to scratching rupture, it will make the perianal skin appear vesiculoblasts, which will cause cracking of the perianal skin, accompanied by itching, pain and other symptoms. 3. Sinusitis: sinusitis is mostly caused by bacterial infection, foreign body stimulation, long-term consumption of spicy, deep-fried and other stimulating foods, etc. When the patient is accompanied by inflammation and hyperplasia and hypertrophy of the anal papilla, the patient’s perianal skin will appear cracked symptoms, and accompanied by anal distension, anal canal falling sensation, anal itching and other symptoms. If the perianal skin cracking, should be timely to the hospital for medical treatment, diagnosed under the guidance of the doctor for treatment, so as not to delay the condition.