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Birthmarks. Most of us have them, many of us love them, and all of us have seen them. These skin growths typically appear at or shortly after birth, and while they may fade over time, they often stick around for quite a while. Most birthmarks fall into one of two categories: pigmented birthmarks or vascular birthmarks. Pigmented birthmarks are caused by an excess of melanocytes (the pigment cells that give your skin its color), while vascular birthmarks occur when blood…