dermatophogia

Hello, I hav been chewing ma skin and swallowing my skin ever since I was young, and it brothers me,though I never go in too deep(not compulsive) ,I also chew the layer parts of ma lips, and internal layers of ma cheeks, though I don't do this daily, it happens when I list expect it, or even when am doing something else, so is this dermatophagia?? Or is it just a part of ma imagination??