What is the difference between a mole and a birthmark?

1. Different causes

Nevus are the most common benign skin tumors in human beings, which are skin manifestations caused by the increase of melanocytes in epidermis and dermis. Birthmark can be generally divided into pigment type and vascular type. Common pigment types include nevus OTA, congenital pigmented nevus, coffee spot, etc. Vascular types include port wine nevus and strawberry hemangioma. Birthmarks can be found at birth, or they may develop gradually several months after birth.

2. Different clinical manifestations

Nevus: they often appear after two years old. It can occur in the skin and mucosa of any part of the body. Lesions are flat or slightly raised maculopapules or maculopapules, which can also be hemispherical, papilloma-like or pedicled, with or without hair, and the number can be single, several to dozens.

birthmark: about 1/3 of newborns will have this kind of birthmark. It is a small, reddish macula, which mostly appears on the back neck, between the eyes, forehead and eyelids. As children grow up, most of them will gradually disappear.

Extended information

The most common birthmark of most newborns is red spot, which may appear all over the body, such as face, limbs and trunk. This kind of nevus flammeus is flat and does not protrude from the skin. If you press it with your fingers, it will fade, but when your fingers are released, the color will recover immediately. However, when the newborn is crying, nursing, yelling, etc., the subcutaneous plaque will be more obvious at this time because of facial congestion and local telangiectasia.

usually, nevus flammeus is related to family genetic factors, but it rarely expands, and besides, this kind of nevus flammeus rarely fades naturally. If it doesn't grow on the face, you don't have to pay attention to it at all.

Baidu Encyclopedia-Birthmark

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People's Network-Why do people have birthmarks? The reasons for birthmarks are very different.