<< A cyst, as in one that is created by parasitic organisms or one that has appeared for no known reason? If its a parasitic cyst, your doctor needs to remove it as well as prescribe you treatments to kill the parasites. >>
WTF MAN! You trying to scare everybody with thoughts of parasitic cysts?! Unless he was swimming in the amazon jungle, it's not likely to be freaking parasites.
Most cysts are just filled with fluid, it's not real pleasant fluid, but it's harmless. Some acne is cystic, and can be treated a number of ways with antibiotics, or surgery for more severe cases. Unfortunately they can come back. Try applying some hot compresses to the area every night (hot towel will do), but not to hot. Also, some astrigent can be helpful. Apply it with cotton ball. Go to a dermatologist if you haven't already.