I have a small pus filled bump on the outside of my lower lip . i have attempted to drain it and it seems to work, then it simply come back. When it is touched it is sore, what is this and how can I get rid of it? I thought it was just a pimple , but it isn t going away, it s been about a week now, but it does not look like a cold sore and is not responding to any cold sore creams.