A couple days ago i started to get a little sore on the left side of my mouth between my lips and now it's turned into a tiny blister. The only thing that worries me is that I've never had any blister, sore, scab anything on the outside of my lips. My fiance has something similar to Angular Cheilitis, but we didn't think that was contagious. Herpies has been ruled out as neither of us have it. I haven't had chapped lips recently, not eaten anything odd.
I'm just worried it's something permanent, or something contagious.