Mites in my skin?

So i always thought i had freckles all over my chest, ever since i was little. now these same tiny black dots under my skin are spreading to other parts of my body like my upper thighs and arms. I was curious one day so i took some tweezers and and pinched and squeezed. Out came a tiny brownish blackish thing. I don't know if its a mite or what (thats what I'm guessing) but they keep appearing all over my body! they don't itch or hurt and i can't find anything about them anywhere on the internet! What could they be and how do i get rid of them?!