Obsessed with picking skin

I need some help and i don't really know where to get it, or even if i can get it. I think i may have a type of ocd. I keep picking at my skin. obsessivly. If i find the slightest little bump on my skin or even underneath my skin i will constantly pick at it and squeeze at it until i am convinced that any dirt under my skin has gone. My face is covered in big scabs through doing this and alot of scars, also i have scars on my arms, and chest from doing this. Could you please help me