Darkening of the perianal area may be related to thrombosed external hemorrhoids or skin pigmentation, which can be treated with medication and surgery. Treatment results vary from person to person. Thrombosed external hemorrhoids is a disease caused by subcutaneous congestion due to thrombosis or rupture of veins in the subrectal venous plexus. Typical symptoms are a prominent dark purple ovoid mass in the perianal area, clearly demarcated and tender to the touch. Common treatment drugs are hemorrhoidal suppositories, stasis and pain relief suppositories. Surgical treatments include thrombosed external hemorrhoidectomy and thrombosed external hemorrhoidectomy. Perianal skin hyperpigmentation refers to the increase of melanin in the basal layer of perianal local skin caused by various reasons, resulting in deepening and aggravating the color of perianal skin. It can be treated with local topical decolorizing agents such as hydroquinone, or with intense pulsed light or pulsed laser. If you find that the perianal skin is black, you should consult a doctor in a timely manner, under the guidance of the doctor reasonable treatment, do not take medication without authorization, so as not to delay the condition. Pay attention to perianal hygiene care, quit smoking and drinking, and maintain a regular routine.