Cutis Marmorata Telangiectatica Congenita (CMTC) is a rare genetic disorder characterized by a mottled, marbled skin pattern caused by dilated capillaries. It is usually present at birth and is caused by a mutation in the PIK3CA gene. Symptoms may include a marbled skin pattern, visible veins, and a lack of sweat glands. In some cases, CMTC may be associated with other medical conditions such as heart defects, skeletal abnormalities, and intellectual disability. Treatment is typically focused on managing any associated conditions and providing supportive care.