Sudden growth of pigmented nevus on the face is mainly related to abnormal cell differentiation during embryonic differentiation, sun exposure, trauma, topical medication, or heredity.
1. Some patients start to develop moles at birth or soon after birth, which are usually junctional moles and related to abnormal cell differentiation during embryonic differentiation. If one of the parents has a mole-loving constitution, the child is also prone to congenital nevus of pigmentation.
2. The cause of nevus pigmentosus is not completely clear at present, but nevus pigmentosus is easy to appear after the local skin is stimulated by external factors. For example, if the skin is exposed to sunlight for a long time, trauma or external use of glucocorticoid and other drugs.
3. Some patients are mole-loving physique, which is usually related to heredity. Pigmented nevus can appear in any part of the body, and some patients will also grow on the face.
After the appearance of pigmented nevus on the face, usually no treatment is needed, if necessary, it can be treated by surgery and physical therapy under the guidance of doctors.