Tonya was born with a large, blotchy birthmark that spans from the top of her buttocks to the bottom of her feet. Known as a port-wine stain, the vascular disorder is caused by a capillary malformation, which creates a dark red or purplish discoloration of the skin. Gastroenterologist Dr. Jorge Rodriguez, also known as “Dr. Disgusting,” examines Tonya’s port-wine stain and tests the nerve sensation in her lower extremities. He then refers Tonya to board-certified dermatologist Dr. Sandra Lee for further evaluation.