A brown mole is generally referred to as a pigmented mole. A pigmented nevus with a black spot in the center may be normal, but the decision needs to be made based on the changes in the black spot. It is also possible that malignant changes may have occurred, which is not normal. Pigmented moles are usually benign and do not usually undergo malignant changes. The black spot in the middle of a brown pigmented mole may be melanin deposition caused by dietary stimulation, friction stimulation, sunlight exposure, etc. As long as this mole does not change color and does not grow rapidly, then there is no harm to the body and there is no need to worry too much. However, if black spots appear on brown pigmented nevus, and the growth rate of the nevus is particularly fast, the border with the surrounding skin is not clear, itching, ulceration, oozing and other symptoms, then there may be malignant changes, which is abnormal, and needs to be treated as early as possible. When a patient has a pigmented nevus with a black spot in the middle, it is recommended to consult a doctor in time, and then give the corresponding treatment after a detailed examination by the doctor.