I have one pimple like bump on my right elbow, bigger than any pimple I've seen before but not huge, it's basically right on the tip of my elbow with a white head and red on the edges, I've had it for a little over a week now, and it hurts to put pressure on it. I'm a 19 year old female, 165 lbs, 5'2, and I haven't bumped my elbow on anything that I can think of.