Intriguing Portrait of a Woman with Unusual Hair Growth, ca. 1896

A woman with hair growing between her shoulder blades. Her condition was probably due to naevus pilosus, aka congenital nevomelanocytic nevus, aka “hairy nevus.” These form with the same ways that Port Wine Stain birthmarks form, but extend into the lower third of the reticular dermis (which the port wine stains don’t).