Coldsore?

I've had this in the corner of my mouth for nearly 2 weeks. The only change I've had is I used a chapstick that melted a little in my car because I forgot to take it out during the day. I don't drink after anyone and I've only kissed my bf I've had for over a year now. Just seems like a long time to have a cold sore. I've only had them a few days.