Melanocytic nevus is a benign tumor composed of many melanocytes. People living in China love you to death. Almost everyone has more than a dozen such melanocyte moles. But for some pigmented nevus, many people worry that it will become malignant and eventually lead to skin cancer. Let's take a look at the following introduction! ? Experts introduced this as follows: 1. Common mole: it is the most common acquired mole, which can appear in any part of the body, but it is most common in the face and neck, and also in the trunk and limbs. Most common moles occur in childhood, from sesame seeds to beans, with brown and black spots and smooth and hairless surface. Pathologically, nevus cells are located at the junction of epidermis and dermis, so it is also called borderline nevus. With the increase of age, some nevus cells go deep into the superficial dermis. At this time, you can see that the mole is slightly higher, the surface is smooth and the boundary is clear. Pathologically, there are nevus cells at the junction of epidermis and dermis and in the superficial dermis, so it is called mixed mole. In adulthood, nevus cells completely enter the dermis, and the clinical manifestations are more prominent hemispherical lesions, which turn brown and sometimes even the same color as the skin, called intradermal nevus. Ordinary moles, especially intradermal moles protruding from the head and face of adults, are mature moles, which will not become malignant, and do not need to be removed except for cosmetic needs. 2. Dysplastic nevus: It mostly occurs in adolescence or even after adulthood. How long it is in the chest, back and waist, slightly larger than ordinary moles, usually more in number, smooth or slightly higher in the center, and the color can be brown, brown-black or orange-red, with different shades. This kind of nevus has nevus cells at the junction of epidermis and dermis, and there are more chances of malignant transformation. However, this kind of mole is relatively rare in yellow people and more common in white people. It is one of the main origins of malignant melanoma, especially in families with melanoma, so foreign countries advocate that this nevus should be removed as soon as possible. 3. Congenital giant nevus: it is present at birth and can occur all over the body, but it is more common in the head, face, back and waist. It is a large black patch with a rough surface and usually rough black hair, such as animal skin. As children get older, wrinkles or verrucous protrusions may appear on the surface. Pathologically, most of these hydatidiform moles are mixed hydatidiform moles, with about 65,438+00% malignant transformation. Therefore, the skin graft should be removed as soon as possible, or liquid nitrogen cryotherapy should be carried out in stages. 4. Congenital nevus: it is also present at birth, but the size is within 10cm. It is characterized by irregular brown-black spots, slightly higher with age, smooth or rough surface, sometimes black hair, and pathologically mixed nevus. According to foreign reports, congenital nevus has a malignant transformation of 0. 1%. Some of the malignant melanomas we have seen are malignant from this kind of nevus, so we advocate early resection of congenital small nevus, especially flat nevus. From the problem of malignant transformation of pigmented nevus mentioned above, we must first make clear whether it is congenital or acquired. Congenital giant nevus is the most prone to malignant transformation, followed by congenital small nevus, and then moles on soles of feet, toes, palms, fingers and nails are also prone to malignant transformation, and should be removed as soon as possible. The abnormal nevus growing on the body should go to the hospital as soon as possible to determine whether it should be removed. As for the hemispherical convex nevus on the head and face, no matter whether there is hair on the surface, it will basically not become malignant, and it does not need treatment except for cosmetic surgery. Signs of malignant transformation of pigmented nevus: A. Asymmetry, with different shapes on both sides of a nevus; B. irregular edges; C. the color is uneven, and the color of the same mole is different; D. the diameter exceeds the size of the pencil head; E. bulge, that is, a part of the mole is raised. In these cases, it should be taken out as soon as possible for pathological examination. ? Experts suggest that if you want to get rid of pigmented nevus safely and effectively, you must go to a regular plastic surgery hospital.