A white head pimple that did not go away since 6 months?

Patient: I have for now 6 months what I thought would be a white head pimple on the tip of my nose. After a month when I realized it is not going away, I tried to pop it out, but it doesn’t. It is really annoying me and looks funny. What could it be? and how should I best treat it?Looking forward for your helpthanks