What is the problem of many black moles on pregnant body? Many black moles on pregnant body are mainly caused by the endocrine hormone disorder in pregnant women’s body after pregnancy, because the hormone level in pregnant women’s body is higher than that of normal people, which leads to endocrine disorder and black moles in the body. In this case, you can go to the dermatology department of the hospital for a specific examination. If there are obvious changes in the size and also the nature of the nevus in the near future, such as the nevus gradually increasing in size or deepening in color, for example, the nevus has recently become significantly darker or hair has grown on the nevus and suddenly there is hair loss without obvious reasons, you need to go to the hospital as soon as possible to see if it is malignant. Therefore, it is recommended to take more rest during pregnancy, avoid fatigue, eat spicy and other stimulating foods, and keep a happy and relaxed mood.