I've bit/picked my lips for years, and picked at my fingers, around the nails and where the callouses are from the guitar. I often just use nail clippers, although of course never on my lips! I don't pick skin anywhere else. I also do it more when I'm anxious, like right now, my anxiety is really high because of a huge OCD trigger. I came across this thread. I don't really know about dermatillomania, aside from it being about skin picking. That's my experience. I've often bit or picked my lips to the point at which they bleed and swell a bit. I have to actively try to stop and put Vaseline on them, but of course I go right on back if I get super anxious, or once it's cleared up.