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Port wine stain

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Introduction
Birthmarks are coloured marks that are visible on the skin and are often present at birth or develop soon afterwards. Some types of birthmark are common.
Treating birthmarks
Most birthmarks are harmless and some disappear without any treatment. Some types of birthmark may need treatment for medical or cosmetic reasons.
Complications associated with birthmarks
Most birthmarks are harmless. However, in rare cases there can be complications which need to be treated.