A natural white hair birthmark, also known as a poliosis, is a patch of white hair that is present at birth. It is caused by a lack of pigment in the hair follicles, and can range in size from a small dot to a large patch. Natural white hair birthmarks are usually permanent, but they can sometimes fade or disappear over time.
Natural white hair birthmarks are often associated with certain genetic conditions, such as Waardenburg syndrome and piebaldism. However, they can also occur in people without any underlying medical conditions. In some cultures, natural white hair birthmarks are considered to be a sign of good luck or fortune.