I have been gluten free for 4 months. Last week I ate out for the first time in several months. I have not had diahrea from this, but my blisters seem to be spreading. My skin still has not cleared up from when i was diagnosed, but it was looking much better until i had the Wendy's chili. Is it possible to get contaminated but only your skin affected (not your somach)?

Yes that is possible. Everyone has different symptoms and some people don't have any GI related issues. Some people actually get no symptoms at all.
From what I have heard it can take a while for the DH to clear up after going gluten free for some people though.