1. A large congenital vascular malformation nevus having a purplish color.

It is usually found on the head and neck and persists throughout life.

2. A large reddish-purple discoloration of the face or neck, usually not elevated above the skin.

It is considered a serious deformity due to its large size and color. In children, these have been treated with the flashlamp-pulsed tunable dye laser.