External hemorrhoids can cause itching around the anus, but also does not exclude patients with anal eczema and ringworm, should be clear reasons for symptomatic treatment. 1. external hemorrhoids: because the external hemorrhoids are in the anal opening, long-term life, will lead to the external hemorrhoids by friction, caused by local inflammation, there will be itching symptoms, at the same time, external hemorrhoids patients will also be due to the secretion from the rectum, and skin irritation caused by itching. 2. anal eczema: generally due to the lack of cleanliness around the anus, and some bad habits, patients around the anus will appear erythema, vesicles, rash symptoms, causing itching. 3. Ringworm: it is caused by red trichophyton infection, living in a humid environment is more common in the population, the patient will appear buttock erythema, pimples at the edge of the skin around the anus will cause obvious itching. When the patient has anal itching, the patient should promptly seek medical attention, clear diagnosis, under the guidance and advice of the doctor for treatment, to avoid delaying the condition.