A skin condition that results from having dirt or oil clogging a
sweat gland or epidermal pore. These highly irritating, and
unsightly formations include many types:  1. White Heads: These
result when large amounts of puss build up under the surface of
the skin. These are the most common type, and are the most
satisfying to pop, as long as you're careful where you're
aiming. These are easy to remedy, but most solutions are only
temporary.  2. Black Heads: Deeply inground dirt can also clog
the skin; however, unlike surface blemishes, these fester more
deeply than their lighter colored cousins. They also may produce
puss in addition. They are much more painful (and therefore much
less fun) to pop. But, once popped, this variety will not
return.  3. Ingrown Hairs: These are caused by scaredy-cat
ostrich type hairs that don't like the surface, and bury their
heads in the ... skin. When mashed, as other types, the hair no
longer has a place to bury its head, and has to face the world
... head on.  4. Scar tissue: