Many moles on the face are usually pigmented moles, and the exact cause of pigmented moles is not very clear at present. It may be related to various factors such as genetic factors, environmental factors, ultraviolet radiation, exposure to various rays and so on.
A pigmented nevus is formed when melanocytes gather abnormally. The exact cause of nevus pigmentosus has not been found. It may be related to genetic factors, and some patients have a family history of inheritance.
Pigmented nevi may be related to factors in the external environment. Exposure to various disease-causing factors in the external environment, including light and chemical substances, may cause an increase in pigmented nevi.
Prolonged exposure to ultraviolet rays may cause damage to the skin. Exposure to more ultraviolet rays may cause pigmented nevi to grow more.
Various kinds of radiation may be a cause of pigmented nevi.
If you have a pigmented nevus, you can go to the dermatology department of a hospital.