Incontinentia pigmenti

Incontinentia pigmenti (IP, also known as "Bloch–Siemens syndrome," "Bloch–Sulzberger disease," "Bloch–Sulzberger syndrome" "melanoblastosis cutis," and "nevus pigmentosus systematicus") is a genetic disorder that affects the skin, hair, teeth, nails, and central nervous system. It is named due to its microscopic appearance.