What Causes A Blotchy Rash On Arms And Legs After Taking A Meth Injection?

Name: Taylor Romero: PT HISTORY: I am a Recovering Heroin addict recieving Methadone Treatment, and also take a multi Viamin, Aspirin (81mg 1xDaily), Vyvanse (50 mg 1xMorning), and today I made the mistake of doing about .3 Gram of Crystal Meth Via IV, and now I have this rash all down my arms, and legs, looks similar to blochy red lines everywhere, and also, on my right wrist (right Forarm) is the place where I did my shot of the crystal, and about 4-5 hours later, my right palm and thumb turn blue and is swollen, I also missed a tiny bit of my shot when shooting into my right foerarm, I was wondering if this is some kind of allergic reaction or am i just being paranoid?