Moles generally refer to dark pigmented nevi, and the sudden growth of a dark pigmented nevus on the face may be related to heredity, ultraviolet radiation and other factors.
Nevus is formed when melanocytes gather in localized nests, and its development is mainly related to genetic factors. In addition, ultraviolet irradiation, medication, trauma, and immunosuppression may also induce the development of nevus pigmentosus.
According to their location in the skin, they can be further classified into junctional nevi, intradermal nevi and mixed nevi. Skin lesions that appear as spots, papules, or plaques can be removed by surgery, laser, and other treatments under the guidance of a doctor.