If you can see it a needle obviously...some you can't see, when you have one of those make a paste up out of Bi Carbonate of Soda tip of a teaspoon and a couple of drops of water....put on a plaster and put on the spot (works for them too)...it will drawn it out in a few hours, though if deep you may have to reapply...it will also kill any bacteria there may be present!