The darkening of the perianal area may be caused by hyperpigmentation, hemorrhoids, thrombosed external hemorrhoids and so on, which can be treated by general treatment, drugs, surgery and other methods. 1. Hyperpigmentation: with age, the perianal gradually color will be black, usually due to hyperpigmentation, if the patient has no special symptoms, is a normal physiological phenomenon, do not have to use any method of intervention. 2. hemorrhoids: perianal black may be due to hemorrhoids, usually with the patient’s age, bad habits and perianal diseases, etc., the patient will appear anal itching, blood and other symptoms, you can use ibuprofen under the guidance of the doctor, acetaminophen and other drugs for pain. External hemorrhoid cream or suppository, hydrocortisone cream, etc. to relieve local discomfort; can also be treated by surgery, such as hemorrhoidal simple excision, mixed hemorrhoids external peeling and internal ligation. 3. thrombosed external hemorrhoids: the disease may be infectious factors, poor diet, defecation habits and other factors, the patient will appear perianal black, pain, you can take a local hot compresses or sit in the bath to accelerate the absorption of thrombus, reduce pain, but also the use of diclofenac sodium tablets, norfloxacin, and other medications for treatment. Serious cases can be thrombosed external hemorrhoid stripping surgery and other treatments. It is recommended that patients go to the hospital in time, under the clear diagnosis of professional doctors, according to the specific conditions, take targeted treatment.