New here. Biting inside of cheeks?

I recently learned about Trichotillomania and I immediately related to it. Except not with hair pulling. Ever since I was a kid I have picked at my skin. I think it started with picking at scabs from bug bites (which I still do) and I remember it progressing to picking at my forehead. Ever since then I haven't been able to stop, I'm constantly searching my body without even knowing it looking for bumps and scabs. I remember people always telling me to stop and I think thats when I started biting at my cheeks, because people couldn't see it. There are 3 main spots I bite, to the point where they bleed and it hurts to eat. I can be watching tv and then realize that my cheeks are bleeding. Most of the information I've read on skin picking is about external picking, a lot of my picking is external but I really want to know if anyone else bites and their cheeks. I remember going to the dentist once and having him ask me about it because they were so inflamed and my lips were all puffy and sore. I remember lying about it. I've read about people playing with toys to keep their hands occupied to stop picking but if I do that I just end up biting my cheeks. So either way I'm almost always picking. If anyone else does this I would really love to hear back. Thank you.