Picking and Pulling Things Apart

My son is 7 and has recently started picking at his nails and pulling skin off to the point where they bleed. He also picks at scabs continuously and just tonight he was caught pulling paint off of a wall that we recently had painted professionally due to him picking paint off of it in the past. We also find small pieces of paper/garbage all over the floor that he rips off of various things such as toy boxes, etc.

Another thing he likes to pick at is erasers. We find tiny pieces everywhere. He's never been tested for SPD.

Do other kids with SPD exhibit this type of behavior? He does have other issues and symptoms of SPD. What sort of therapy would help him to stop this behavior?

He also breaks things often (toys, zippers, etc.). Thanks in advance!