In addition to a marbled appearance to the skin, individuals may have pink/red birth marks (see entry Vascular Birthmarks), particularly over the upper lip. Macrocephaly (large head size) is usually present along with webbing between the second and third toes and sometimes between the fingers. Occasionally, extra fingers or toes may be present. It is also common to have one side of the body which is slightly larger than the other (hemihypertrophy).
Whilst cutis marmorata can occur on its own, only individuals with the other, additional features can be said to have MCAP syndrome.
Babies with MCAP syndrome often have a high birth weight. It is common for children with this condition to have low muscle tone and so there may be initial difficulties with feeding. Children with MCAP syndrome are often slow to learn to sit and walk because they have low muscle tone and very mobile joints. Many children with MCAP syndrome learn at a slower rate than normal, but the condition is extremely variable and some affected individuals have normal development.
There are other rarer complications of MCAP syndrome which include heart problems, seizures, internal blood vessel malformations and developmental abnormalities of the brain. Many children, however, have good general health.