Until I was about thirty four,
I was a nail biter. I don’t know why, and at that time, I just stopped. No reason for that either, I just didn’t anymore.
The upside is I don’t have bleeding fingers all the time. The downside is, once in a while, I scratch myself until I bleed. Tonight, it was the inside of my left thigh, a stream of pink running down the bathtub drain. very nice. Now my thigh will scab up to my underwear and changing clothes will result in renewed bleeding for a couple of days.

I was going to suggest a bandaid but now I’m thinking with the placement of your scratch, the depilatory effect associated with removal of it might hurt worse than ripping your drawers off of the scratch.
Two words: superglue. OK, one. I’d be careful not to get it in your hairs.
M
You’re welcome.
M
A few years ago I was scratching at my lower shin and accidentally scratched open an artery; just a pinhole-sized opening. I looked down after scratching and thought I saw a dark thread hanging from my leg, but when I went to grab it, my fingers passed through it: the thread was an arterial spray, and I had to hustle into my bedroom to close it with a tightly-wound Ace bandage and a clean washcloth. The bandage did the trick, and I didn’t have to visit the doctor or emergency room for stitches or further treatment. Scary, though, for a minute or two.
Maybe a Kotex would end your misery. When I was a Park Ranger, I carried a box of them to use as compresses for people who cut their feet on beer bottle glass. Tie that pony on and send ’em to the ER to get sewed up. Had 5 of those on one bad day in the park, once.
Og,
I’m about your age. I still bite my nails. The nails are getting a little tougher though. I’m afraid one day I’ll break a tooth. Sounds better than bleeding to death though. Yeef!