So, I shoot heroin mixed with crack. When it's shot in my neck, everything is fine, no weird reaction. My arm or hand, maybe a little but not much. But, for whatever reason, when I hit and plunge in my foot, its the most painful burning and itching in my toes and the bottom of my foot. Not where I injected, and it doesn't matter if I change spots. There's no miss bump (from a full miss), or miss blotches (which I get when I hit, but for whatever reason I don't get all of it), and I get a full rush, but the whole bottom of my foot turns into the most painful burning rash for like 10 minutes and goes away... any thoughts?