Cutis marmorata telangiectatica congenita (CMTC) is a rare condition that mainly affects the blood vessels of the skin. It is usually seen at birth or soon after.

CMTC appears as marble-like pattern on the surface of the skin, called mottling. This purplish pattern is similar to the fishnet-like blotches seen in young infants when they are cold. In children with CMTC, the marbling is more severe and always visible.