Answer:
First off, I am not a doctor, but an occasional user. Today I got something (really good), and after the first shot, my whole hand instantly got a rash from the elbow all the way down to my fingers. The thing is that this was the only time this has ever happened to me, and I am also wondering why. Maybe it was an allergic reaction to one of the things the dude cut it with, but yet again, I'm not a doctor. I hope this helped.