My Master and I participate in blood play. I did a lot of research on it prior to trying it. A lot of it was that it was a way for a Dom/me to take in their sub and vice versa. I too was a cutter. Mainly on my arms. So, when we decided to try it, we agreed that my arms were off limits. We prefer the area on my inner thigh right by my who-ha. And on Him, His chest was where I drank from. We took this as a firm of branding as well. I now have a scar where I was cut the deepest. It is only seen when I am in a bikini and when I'm asked Wtf, I use the excuse that I was climbing a fence and git caught :/... My cut did not heal straight and people rarely question my answer. My Master is into vapirism as well. It is not something we do on a regular basis. It's one of those erotic occasional things that we really enjoy. It is not the same as cutting. Cutting is an emotional and psychological problem to where blood play is a kink. Maybe try to do the play in a spot different from where you used to cut and one that isn't in plain sight of the people you interact with. I would say that if you insist that the blood play be done in an area that you used to cut in, you might need to self reflect on if you really are allowing it to happen based off of old habits. If you are able to try a new spot on the body, it may be better for you mentally. I know I didn't want old scars on my arms made thicker and noticeable.