Compulsive Skin Picking

Dermatillomania (also known as compulsive skin picking or CSP) is an obsessive compulsive disorder characterized by the repeated urge to pick at one's own skin, often to the extent that damage is caused.
Disfiguration of the distal and proximal joints of the middle and little fingers.
Disfiguration of the distal and proximal joints of the middle and little fingers.

Sufferers of dermatillomania find skin picking to be stress relieving or gratifying rather than painful.