hi - welcome.
Yeah, my gran did that for years and years... all my growing up. Then one day her arms were totally clear (they had been covered in scabs from wrists to shoulders). I asked her when she had stopped and she didn't even know! She just stopped one day and they healed after at least 3 decades of picking.
guess there's hope eh?
"They" say that when the SI becomes painful it is no longer doing it's "job" and it will stop.
Best, Kiya