What is incontinentia pigmenti (IP)?

Dr. Jeanne Morrison, PhD
Family Practitioner

Incontinentia pigmenti (IP) is an inherited disorder of skin pigmentation that is also associated with abnormalities of the teeth, skeletal system, eyes, and central nervous system (CNS). It is one of a group of gene-linked diseases known as neurocutaneous disorders. In most cases, IP is caused by mutations in a gene called NEMO (NF-kappaB essential modulator). Males are more severely affected than females. Discolored skin is caused by excessive deposits of melanin (normal skin pigment). Most newborns with IP develop discolored skin within the first two weeks. The pigmentation involves the trunk and extremities, is slate grey, blue, or brown, and is distributed in irregular marbled or wavy lines. The discoloration fades with age. Neurological problems include loss of brain tissue (known as cerebral atrophy), the formation of small cavities in the central white matter of the brain, and the loss of neurons in the cerebellar cortex. About 20 percent of children with IP have slow motor development, muscle weakness in one or both sides of the body, mental retardation, and seizures. They are also likely to have visual problems, including crossed eyes, cataracts, and severe visual loss. Dental problems are also common, including missing or peg-shaped teeth. A related disorder, incontinentia pigmenti achromians, features skin patterns of light, unpigmented swirls and streaks that are the reverse of IP. Associated neurological problems are similar.

This answer is based on source information from the National Institute of Neurological Disorders and Stroke.

Continue Learning about Genetic Disorders

Caregiving for A Young Adult with SMA
Caregiving for A Young Adult with SMA
Spinal muscular atrophy (SMA) is a disease that causes muscles to weaken and atrophy. There are different types, some of which are diagnosed at birth ...
Read More
Why can hereditary hemorrhagic telangiectasia (HHT) cause nosebleeds?
Society of Interventional RadiologySociety of Interventional Radiology
Hereditary hemorrhagic telangiectasia (HHT) is a vascular disorder, which is due to a malformation o...
More Answers
How can I lower my risk of inherited health conditions?
Dr. Mehmet Oz, MDDr. Mehmet Oz, MD
Your inherited genes are less important than if you wear out your jeans with physical activity. ...
More Answers
How is chronic acid sphingomyelinase deficiency (ASMD) diagnosed?
Jumo HealthJumo Health
To check for chronic acid sphingomyelinase deficiency (ASMD), a doctor will do some tests. A blood t...
More Answers

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.