Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Port wine stain
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Port wine stain: A mark on the skin that resembles port wine (porto) in its rich ruby red color. Due to an abnormal aggregation of capillaries, a port wine stain is a type of vascular malformation (vascular birthmark). A port wine stain on the face is a sign of the Sturge-Weber syndrome.