Black hard stones squeezed out of the skin

If the so-called black hard stone is squeezed out of the skin, it may be a certain sebaceous cyst. The black substance squeezed out may be the fat plug produced by the original patient. After a period of time, these fat plugs may gradually become necrotic and gradually dry, eventually forming obvious blackheads. However, some individuals with acne are larger, so some people think it is black stone.