Picking in multiple areas.

Hello, I am a 21 year old girl living in Australia. Skin picking has always been an issue for me, since I can remember. As a little girl I used to pick callouses on my hands and bite my lips when they were dry. I have no idea what set off the picking habit, but I suppose I was an anxious child. I pick my skin in different places at different times, and I think this allows me to hide it better. For me, the most pleasurable places to pick include my nails, skin around my nails, heels of my feet and my lips. Over time I have caused much damage to the skin, including being unable to walk on my feet without pain because I have ripped so much skin off my heals that they are raw and bleeding. If my lips are ever dry for any reason I pick at them until they bleed and look like cold sores. It can be very embarrassing, and people must just think I'm a complete nutcase. But after I have done enough damage to the area I have been picking for a few weeks I will move to another area, and once the old area has healed I will go back to picking there, and so on. I suffered much abuse and neglect at the hands of both of my parents, as both of my parents suffer from mental illnesses and substance abuse issues, but I still cannot see the origin of the skin picking. I do suffer from daily anxiety and monthly depression, and have been on anti-depressants (which didn't put a dent in my skin picking issues). At certain times in my life I have been able to not pick, but I always eventually go back to skin picking. I have been doing research recently into this strange habit and found this forum. I am relieved that I'm not the only person with this detrimental habit and I would really like to know how other people deal with skin picking. Thank you for reading.