Allergic reaction to new mouthpiece. (A cautionary tale)

I had one of my good friends and repair tech throw together a new mouthpiece for me. It’s made of something he calls a “mystery alloy” and he refuses to tell me what the alloy is made of. Since I started using it I’ve developed green boils around my embouchure. The moral of the story is don’t play on mouthpieces made of “mystery alloys”