Just thought I'd update everyone on what happened. After developing flu symptoms, including a fever, I ended up with lesions on both shins that looked and felt like raised, red, bruises. I was diagnosed with Erythema Nodosum. According to my gastro (and per research references) I am one of those extremely RARE ones in which 6-MP actually caused my E. Nodosum and flu symptoms!!! I have a hypersensitivity to mercaptopurine, even though I tested out fine with the TPMT enzyme. Doctors learn something new every day.
After stopping the 6-MP on 8/7, my E. Nodosum lesions and flu symptoms have subsided greatly.
Note: I posted the above info on another thread "Diagnosed with Erythema Nodosum---Questions" for those who want to follow this.
Thanks for your responses to my original posting!!