They are most common on the forehead, eyelids, upper lip, between the eyebrows, and the back of the neck. They may be more noticeable when the infant cries or during temperature changes. They often fade as the infant grows. Salmon patches on the back of the neck may not fade but are usually not noticeable as the hair grows. There is no known way to prevent birthmarks.
Diagnosis is based primarily on the appearance of the skin lesion .
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