"Glabrous"

A technical adjective for a surface, usually skin, that is smooth and lacking hair, fur, down, etc.. Specifically carries the connotation of skin that has never had hair, such as our young nymph here. who has yet to grow a beard. (Character may not be as he appears in image.)

The unusual word choice is itself significant; "glabrous" is more typically used to refer to leaves, and devils have a strong symbolic association with flowers...