We present a second case of alopecia areata sparing a congenital nevus of t
he eyebrow, This inverse counterpart of perinevoid alopecia is discussed an
d placed in context to the recently described Renbok phenomenon. According
to the present definition of a nevus as a genetic mosaic, a genetically det
ermined resistance to alopecia areata is suggested in our case, Copyright (
C) 2000 S. Karger AG, Basel.