Coloring Hair While Suffering from Poison Ivy Rash?

This is going to seem very petty, but here goes. My roots could really use a touch up, but I have poison ivy going on 2 weeks now. Since it is an immune system response, would it be safe to color my hair or might I enter the ninth circle of hell? The package instructions always advise doing a patch test before every application, so maybe this is the time to follow the directions. Anybody have experience with this particular issue?

By Marne