I get a cold sore about once a year. I have one currently on upper left side lip and noticed that I have swollen nodes under left chin?

L-lysine. You may have herpes simplex one which can cause cold sores. You may try the supplement L-lysine which may reduce the frequency. Also at the first sign of the cold sore you could take an antiviral, two doses. Also there is a steroid gel you can use to help resolution. Happy healing!