So I'm 16 right now, and very well aware of what I need to do to to keep my face from breaking out. But I see these little white, hard pebble like things on the top of my chin just under my lip. When I try to squeeze them out they don't budge. And I even tried to use the head of a needle to move them out but they almost seem to be attached with tissue under them. They are very very small and not noticeable or painful, but it's just not pleasant having them there. Any thoughts on what they could be, and what I should do to get rid of them?