Two good ones:
On my finger, because I was hot glueing a block with a hole in it, and I decided putting hot glue on one side wouldn’t be sufficient and turned it over.
On my arm, because I fell down a flight of stone steps in the misty darkness and managed to save my backpack (with my computer), my purse (with my Kindle), and my neck, but not my arm. Then I refused medical treatment from the doctor in the house because “it was just a scrape and it wasn’t bleeding through the bandages that quickly.” It looks like my right arm is just extra hairy, like maybe I’m perpetually almost turning into a demiwerewolf.