I enjoy scratching my scalp
I enjoy scratching my scalp, especially when it's a bit dirty and the dirt catches under my finger nails and piles up until I can feel it and I am forced to pick it out with my other nails. I usually then spread the dirt paste onto a piece of paper. I know it sounds gross but I only do it in my own privacy and shower regularly. I just enjoy doing this once in a while. Is it normal?