Practically there are no people on the body that did not have any birthmarks.
According to doctors, the number should be around 20 pieces. However, there are times when they number more or fewer.
In the normal development of the body, they do not pose any danger, but there are times when you begin to notice that their number was sharply increased, or they have begun to change color, shape, in such cases it is necessary to bother.
The fact that in most cases, nevi, and the scientific name for them, inherited, however, sometimes they are caused by metabolic disorders or due to prolonged exposure to direct sunlight.
If a mole has a convex shape, it may be some disadvantages, because, often touching it can hurt, and this in turn may affect the occurrence of cancer.
In such cases, it is better to seek help from professionals who are using a laser to remove it, and this procedure is painless and leaves no scars.Source: www.goodshelp.com