Cold sore?

Haley

I just really need to know what this is and what to do for it

UPDATE:

Is there anything new y’all see that could be something different or anything like that? Please do not make this seem like I think y’all’s previous responses were wrong at all, I just want to keep myself educated and do whatever needs to be done for it. Thank y’all so much!! It’s sorta whiteish on the top now & it’s gotten bigger.