The symptoms of dermatillomania, now known as excoriation disorder are compulsive picking, biting, pulling, scratching, or other irritation of the skin that has caused interruptions to social or physical lifestyle.
This is different from deliberate picking of the skin meant to cause harm or pain, which is self harm.
There are two types of picking recognized: automatic and focused. Automatic picking is done without consciously being aware of it, usually when doing an activity where the hands are idle. Focused picking is an compulsion driven episode of deliberate picking that is most often brought on by triggers such as stress and anxiety.
Dermatillomania also has secondary symptoms such as infection, depression, anxiety, pain, bleeding, and loss of self-worth. Sometimes these are comorbid and exacerbated by dermatillomania and sometimes they are directly caused by it.
If I could get rid of some of the symptoms it would be scanning, the compulsion to rub over my skin and find imperfections to pick. This would stop a great deal of my picking, personally.