Nevus flammeus is the most common benign congenital capillary malformation, often known as a port-wine stain. Sturge–Weber syndrome (SWS) is a congenital, sporadic, nonfamilial disease characterized by intracranial and ophthalmic vascular anomalies and nevus flammeus. It usually manifests as developmental delay, learning problems, paralysis, seizures, glaucoma and attention deficit, and hyperactivity disorder. A 29-year-old male patient presented with a reddish patch over the face since birth. He was found to have hemihypertrophy of face, hemiparesis of right limbs, and low intelligence quotient. On ophthalmic examination, the patient was found to have glaucoma and only perception of light in the left eye. Computed tomography brain showed atrophy of the left cerebral hemisphere and calcifications in the left frontal, parietal and occipital regions. With these findings, he was diagnosed as SWS type I. A multidisciplinary approach was followed for patient evaluation and management. This case also highlights the irreversible sequelae of this rare phacomatosis.