Skin is the outer covering on the bodies of animals or human beings. It protects muscles, bones and the internal organs. As it is in direct contact with the environment, it protects the body from viruses, parasites, etc. Other functions of the skin are insulation, temperature regulation and sensation. It also supports the production of important vitamins such as vitamin D and B. The color ad type of skin varies across populations. There are three main layers of the skin: epidermis, dermis and subcutaneous.
Birthmarks are colored marks on the skin that are noticeable at birth, or shortly afterwards. There are two types of birthmarks: pigmented and vascular. Pigmented birthmarks are caused by clusters of pigment cells; they are usually tan or brown-colored. Vascular birthmarks are caused by abnormal blood vessels in or under the skin; they are often red, purple or pink. Appearance of birthmarks is found somewhere on almost every person’s body. They are mostly harmless and don’t need to be treated.