They are not passed genetically from one generation to the next. Vascular lesions most frequently appear on the face, neck, and upper body, and include port wine stains and strawberry hemangiomas. Port wine stains are present at birth and grow larger as the patient grows, thereby covering the same relative proportion of skin. As the patient gets older, port wine stains can turn darker red and become more prominent. With time, they can also grow thicker and less smooth.
Strawberry hemangiomas develop after birth, grow rapidly, and usually go away on their own.
Unless the lesion bleeds or interferes with a vital function, no treatment is necessary. Pigmented lesions include those that are due to the body's natural pigment, such as cafe au lait spots, moles, freckles, and liver spots, as well as tattoos, which are caused by the introduction of foreign pigments into the skin. Cafe au lait spots are tan lesions of irregular shape that are present at birth. Moles, which are also present at birth, are smaller and more regular in shape. Freckles and liver spots appear after birth in response to sunlight exposure and age.