I felt a sore throat (but I have acid reflux and I had felt acid in my throat), and then an itching sensation (no burning, swelling, reddening or fever). I found a circle like dot on my top lip. I have had something like this before, but it wasn't a cold sore. So immediately I put some abreva on it. It never hurt to touch it, and it didn't look like a blister at all because It didn't look fluid filled. At one point this piece of skin came off and nothing came out. It was small and it didn't develop into anything clustered. Is this a cold sore? Please help!