I took a class many years ago with some NYC dommes from a professional tattoo artist who also did scarification (branding). Like most things it is not hard to do once you know how, but if you don't know, it is easy to mess up terribly.

It's cool to know how to do, but I have only done it on practice chicken breasts from the shop. Personally, I feel it is highly inappropriate in a professional setting. My clients carry a "brand" on the inside of their skulls. If a lifestyle domme wanted me to brand her slave for her, I would consider that, but it's just as easy to teach her how to do it.

So even though I know how to do it, I would not list it on my activities. I have never had a serious request for it, nor do I have a particular interest to scarify, tattoo or otherwise mark permanently my personals.