for those who do SH by pulling hair, picking at skin etc

[Blueberry]

this could be an interesting thing to watch:
https://www.bbc.com/news/av/uk-51879695/coronavirus-why-we-touch-our-faces-and-how-to-stop-it

Since I SH by pretty much constantly pulling the hair on my head and eyelashes out, it really interested me anyway. It may be a way to calm myself that's gone a bit wrong, but hard-wired in my brain since before birth.

There are ways to try and teach yourself not to though - mentioned and shown in the video.