Sturge-Weber syndrome.
Facial port wine stain and seizures are both common symptoms of Sturge-Weber syndrome, a rare neurological disorder that affects the development of blood vessels in the brain and skin. The port wine stain is a type of birthmark that is caused by an overgrowth of blood vessels in the skin, and it is typically present on one side of the face in individuals with Sturge-Weber syndrome. Seizures are a common neurological symptom of the disorder, usually beginning in infancy or early childhood. Other symptoms of Sturge-Weber syndrome can include developmental delays, glaucoma, and intellectual disability. a