First aid and self-care information for a splinter. A splinter, or sliver, is a particle of a foreign object, such as a small piece of wood that has embedded itself in ones skin. Splinters can sometimes come out on their own or be pulled or milked (by gently squeezing on each side of the splinter) out easily, but others can be deeply embedded and difficult to remove. All splinters should be removed as promptly as possible. If a splinter becomes wet, it makes the area prone to infection.