Sensory Cognitive Affective Motor and Place aka SCAMP is the self-monitoring technique that has dramatically improved my own issues with BFRB, specifically skin-picking disorder. You do a little bit of homework recording all the moments in your week where you slipped up or got carried away and hurt yourself, note all the triggers in that situation that fall under the SCAMP acronym and then set a predetermined replacement behavior. You need to keep practicing until it becomes second nature, but when I’m good and do the work this therapy technique is literally so effective it is LIBERATING.
Fellow skin-picking disorder-lings and other body focused repetitive behavioresses this is the book: Overcoming Body-Focused Repetitive Behaviors: A Comprehensive Behavioral Treatment for Hair Pulling and Skin Picking. Check for it in your local library (that’s where I found mine) or get it in InterLibrary Loan if you’d rather not buy til you try. There are worksheets in the back which I recommend finding online or just remaking in a template doc for yourself.