s embedded deep within the
skin, has no visible head, is shiny but not overly-
oily, and the only way I can ever get it to open to relieve pressure is by stabbing a (sterilized) needle a few millimeters into my flesh until I "break through," in which case a mix of blood and oil will come out only to eventually seal up and become pressurized again, usually with blood being visibly trapped under the skin.