In most cases, the black around the anus is a normal phenomenon, as follows: 1, normal phenomenon: the anal department is the place to excrete stool, so the local pigmentation will easily appear, the color will be darker. This is not to worry too much, no special treatment, neither the need to take drugs, nor the need to apply drugs externally. 2, there are infections occur: a small number of perianal black is due to a previous infection, so you can go to the hospital surgery for clarification. If you find an infection, you can take antibiotics for treatment, and if necessary, also with drug sitz bath treatment. You should pay attention to your diet, try not to drink drinks containing alcohol, do not eat spicy food, you can properly intake fresh fruits and green vegetables, etc. However, if the local area is obviously black and has broken, or even broken repeatedly, this may be melanoma, and need to go to the hospital dermatology or surgery as soon as possible for clarification.