Pimple or cold sore?

Felt a sensitive bump forming yesterday morning and by the time I got home there was a white head. 1 day on it looks similar but the white head is a bit bigger (see photo). not on my lip but just below the line. I used to get pimples quite a bit and it does feel like one but I always get nervous when they are near the lip thoughts?

image

pimple.

Thanks. Anyone else got an opinion?