Incontinentia pigmenti (IP) is extremely rare. The main features occur in the skin where a blistering rash occurs in the newborn period, followed by the blisters becoming raised-like warts. Next, brown swirls appear in the skin, followed by the appearance of light swirls. The result is a "marble cake-like" appearance on the skin. Other health problems can be seen in IP involving the eyes, central nervous system, teeth, nails, and hair. The severity varies from person to person.