A nevocytic nevus (or melanocytic nevus or mole) is a skin lesion that contains nevus cells, which is a type of melanocyte. Moles are just one part of a broader classification of skin lesions called nevi.
A person will most likely get the majority of his/her moles between the ages of zero and around the twenties. About 1 percent of babies born have at least one mole. Benign neoplasm is responsible for people getting moles later in life. Other moles are generally regarded as malformations (congenital moles). People with congenital moles risk contracting melanoma.
Not all moles present themselves as growths on the skin. Some form under the skin (subdermal moles). Moles are generally formed of amelanocyte (a type of cell). They get their dark pigmentation from a high concentration of melanin (the agent that is responsible for skin pigmentation).
SKIN MOLESThe most common kinds of moles, as per the America Academy of Dermatology, are raised moles, flat moles or skin tags. Benign moles are small; they are usually an oval or circular shape. Some, though, can be relatively large.
Some moles have dark, unattractive hair growing on them. These hairs are usually removed via a number of different procedures; cosmetic waxing, plucking, threading, electrolysis and cauterization.
There is still some debate as to the causes of moles. The most likely cause of moles is embryologic development defects. This happens around the first three months of pregnancy. This embryologic development defect, presumably, causes melanocytes to increase in number. Melanocytes are the cells that are responsible for normal skin colour in the body. The defect causes these cells to develop rather rapidly. As a result, the melanocytes do not spread out as they should. They develop in a number of clusters. These clusters then cause the skin to pigment abnormally in some parts of the body.
Then, the baby is born with congenital nevi. These do not count as dangerous moles. Cancerous moles are more likely to appear during a person’s lifetime, not before birth. This is why a person with a relatively big mole (one that is larger than the size of a typical pencil eraser), should get checked.
These large moles are known as dysplastic nevi. They usually assume an irregular shape and have an uneven distribution of colour. The edges may be uneven as well. Dysplastic nevi are more likely to become melanoma (skin cancer) than congenital nevi. People with multiple dysplastic nevi have a higher chance of developing this grave form of skin cancer. Changes in a mole should also be checked.