Fucking hell boost still doesn't support spoilers and I was not prepared for this
Is it still going? If it is, I'd call the nurse on call. They'll ask some questions and advise if you should go in to hospital. Imo (not a doctor), that doesn't really look stitchable, your primary concern is probably infection, so antiseptic and gauze is probably what you need
Edit: I read 42 as 12. If it's still going now after over an hour, you should definitely call NoC