familial multiple nevi flammei (Monarch Disease Ontology id MONDO_0008094) is a congenital vascular malformation in the skin (birthmark) characterized by the presence of dilated capillaries. The affected area of the skin is flat and reddish-purplish in color. Also known as: Nevus flammeus, Salmon patch Nevus, capillary malformations, congenital, 1, somatic, mosaic, familial multiple port-wine stains, port wine Nevus, port wine birthmark, port wine stain, port wine stain of skin.