Use silver gel. My guess, fungal infection--it isn't obvious like herpes. But once fungus gets into the skin (and there's more around cuz they spray it in the chem trails), it can be pretty annoying and hard to kill. So apply once at night, once in the morning, and after eating.
I'll bet it's gone within a week or so, like mine was, although because I didn't let it run rampant and destroy my lip surface, I surely couldn't have had it--discounting entirely the fact I'm quite pro active about health stuff and treated it causally for a number of years before I got serious and did that after every meal thing and got rid of it entirely. I just mustn't have had it. Right.