The sudden growth of many mole-like black spots on the body may be due to certain physiological factors, or it may be a symptomatic manifestation of some diseases, such as melanocytic nevi, melanoma, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Physiological factors: due to prolonged ultraviolet irradiation, melanin deposits on the surface of the skin, or prolonged late-night work, excessive intake of spicy, oily, cold and stimulating food, resulting in the body’s toxins can not be discharged in a timely manner, the formation of black deposits, can appear on the body of the black dots suddenly grow a lot of moles like. 2. Pathologic factors. (1) Melanocytic nevus: a common benign skin tumor composed of pigment-containing nevus cells, congenital melanocytic nevus is present at birth, and acquired nevus occurs in childhood or puberty, usually occurring in the trunk, and is characterized by black, black-brown, and maculopapular rashes, and can be manifested as a slightly elevated black spot. No treatment is usually needed, or it can be treated by surgical excision or cryotherapy. (2) Melanoma: a disease caused by excessive proliferation or malignant proliferation of melanocytes. In the early stage of the disease, slightly elevated black papules appear on the patient’s skin, and the lesions may gradually expand over time, and vesicles may occur. Melanoma has a high degree of malignancy and requires timely diagnosis and treatment. Suddenly grow a lot of mole-like black spots on the body, after excluding physiological factors, you should consult a doctor in a timely manner to find out the cause of the disease, and the doctor will carry out targeted treatment, do not blindly deal with it on your own.