so today it felt like the inside part of my upper lip was like tingling and when i looked there was a colorless sour on it like barely noticeable but its irritating the c**p out of me a i dont know what it is. is it possible that its some type of std?????????
While it's possible its an STD it doesn't have to be.
It could be caused by trauma (bite or hot food), a cold sore, or a canker sore.
Give it a few days, see what happens.
Hope it helps.