Is compulsive picking and scratching of skin an ADHD thing?

I told my boyfriend, who also has ADHD , about how I often end up picking my skin or biting my nails or scratching myself for long periods of time and can find it hard to stop because when I do I get an intense feeling to go back. I assumed this was an ADHD stimulation kind of thing and asked him if he does it too. He said he sounded worried and said he doesn’t relate to it at all and worries it might be a sign of something like OCD. Does anyone have any input