Growing, and painful lump on bottom left side of my jawbone. I have no idea what it is or how I got it, all i know is that it may be related to a cold sore i have on the left side of my lips? My friend has mono right now and hes telling me I may have it because he had the same thing. i think it may be my lymph node, but it may be a swollen gland due to the cold sore. It's easily visible to the eye, hurts on touch. Any ideas?