port wine stain 
noun
A kind of large, deep red birthmark, a persistent haemangioma or naevus, typically on the face.Do you have a birthmark such as a port wine stain?...
- In Sturge - Weber Syndrome the port wine stain is associated with deeper blood vessel abnormality affecting brain function and some individuals have learning difficulties.
- Convulsions usually appear on the side of the body opposite the port wine stain and vary in severity.
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