Thank you so much!
Yes it was, and I didn't know how to deal with it, and after I scratched the cold sore by accident this dry blister happened and it freaked me out. I don't feel itchiness or anything. Feels weird when touching it softly when washing my face, like a dry skin hanging on my lip.
But yeah, I will just leave it as it is until it comes off.
Thank you for your help and knowledge!