Definition of Incontinentia pigmenti :

Incontinentia pigmenti is skin condition passed down through families that causes unusual blistering and changes in skin color.

See also: Incontinentia pigmenti achromians

Causes, incidence, and risk factors:

Incontinentia pigmenti (IP) is caused by a genetic defect. In most cases, there is a problem with one of the genes located on the X chromosome.

See also: X-linked trait

The condition is most often seen in females. When it occurs in males, it can be deadly.

Most babies born with IP develop discolored skin within the first 2 weeks. The discolored skin occurs when a substance called melanin builds up under the skin. Melanin gives skin its color.