A mole in clinical practice actually refers to a pigmented mole, especially for places where it is often a mole that itself is relatively large and protrudes from the skin or has hair growth on it, such a mole is often referred to as an intradermal mole or a mixed hemorrhoid. The so-called pigmented nevus may indeed become larger in the clinic, generally the pigmented nevus becomes larger: 1, the local pigmented nevus is repeatedly stimulated, like patients if the pigmented nevus is easily rubbed repeatedly, or if the patients themselves repeatedly scratch, it will lead to obvious local enlargement. 2, the nevus becomes obviously larger because the part is accidentally scratched or stimulated by trauma, which leads to If the nevus is obviously enlarged, patients must be alert to the possibility of malignant transformation, because when malignant transformation occurs in a nevus, its shape will be significantly enlarged and often irregular.