It could also be the development of dermatillomania, a condition said to be characterised as a form of OCD. See these sites:
OCDLA
Skinpick
NHS
Biting the skin around your nails or pulling the top layer of skin off your lips are signs of developing anxiety disorders.
Read more psychology facts Here
The brain is an organ. Mental illnesses are illnesses of that organ. Brain scans show that there is a physical difference between a healthy brain and a sick brain. Telling someone “You’re not really sick. It’s all in your head.” is like telling someone with asthma “It’s not real, it’s all in your lungs.” The brain is an organ that can malfunction as much as any other organ.