Whorled Scarring Alopecia - The Only Adult Marker of Incontinentia Pigmenti.

Incontinentia pigmenti (IP) is a rare X-linked dominant disease that affects the ectodermal tissues. It is associated with a whorled pattern of scarring alopecia, which is possibly underreported. This scarring alopecia could be used as a marker to identify adult women affected with IP as older patients may have minimal cutaneous manifestations.