port wine stain
US /ˌpɔːrt waɪn ˈsteɪn/
UK /ˌpɔːrt waɪn ˈsteɪn/
1.
a birthmark in which a large area of the skin is a reddish-purple color, caused by a vascular anomaly (capillary malformation)
:
•
The child had a prominent port-wine stain on her cheek.
•
Laser treatment can help lighten a port-wine stain.