Storing or hoarding of skin/scabs

Hi guys, It's fulfilling to hear I am not alone, I've felt so isolated like some freak for years... My compulsion is I pick the skin off the bottom of my feet, I don't know why, I find myself doing this watching the tv, when I'm in the bath, etc. I use my fingers, tweezers, or anything to hand, but my biggest shame about this is I've always had the need to either eat or store this skin. The small pieces I find myself putting them in my mouth like some shameful pork scratching...the larger pieces I store as a embarrassing keepsake in a guilt box in my dresser drawer. I've never had any issues with hoarding and other than this I still don't. My fiancé is the only one who knows, he finds it weird and will request frequently that I throw this skin away, but just the thought makes me anxious, my collection is growing and I now have approx two teacups full of dead skin stored and I can't stop! The most shameful issue for me is I am a mental health nurse, I've been qualified and working in mental health for over three years and I find m yself Keats over analysing this behaviour, my colleagues know I've suffered periods of depression since I was 19 (I'm now 25) but I'd b horrified if they knew my true shame. Am I alone? Why do I do this? I also get satisfaction looking at the box of skin and playing with it when I'm on my own....weird huh? Xxxxx