cold sore !!!

Khouloud • I belong somewhere.
I'm having my first cold sore ever cause im such an idiot for kissing my bf while he's having a cold sore .. and well, it was formed in shape of tiny bubbles that itched a bit , and then these bubbles bursted i guess and turned into these cuts that burn sooo much and now i have no clue what to do and im afraid it will just spread all over !!!