Is this Lupus or just and Allergy to Zrytec or Pisatchios

I have had a pink scaly rash on my torso, neck, arms and legs.  I was infected by Citrobacter Koseri in December of 2006.  I have been under a lot of stress lately.  Is this a Lupus flare or could it be I'm allergic to Zrytec or Pistachio nuts?

I ate the pistachios the night before the outbreak.  I ate them again Monday night and now I seem to have more on one arm.  Still under bad stress.  Infectious disease says it can lead to Lupus.  What is the test for Lupus?

[luppygirl]

My first symptom for Lupus that I had was hives.  One bad case of hives. I had to admitted to the hospital because i went into anaphaxis (sp) and my throat closed over on me. My face swelled and so did my lips ( which i didn't mind, I kind wanted to keep the full Angalina Jolie lips thing) I am just telling you this is because alot of people don't realize that hives can be a sympton of Lupus. I even went for allergy tests. and since lupus is autoimmune i guess you could say i am allergic to myself  lol