About two months ago a hard bump formed under my jawline (I'm a male). It is very hard, and seems to continually swell a bit, then recede, then swell up again. About two weeks ago I used tweezers to pull a hair out of the edge of the bump; the hair was long, and was actually two hairs stuck together and encased in a hard, clear shell (it was really kind of wierd). I though this was the cause of the bump, but it has not gone away and is still as swollen as ever. Is there a chance this is a cyst, or is it likely an ingrown hair that is still trapped way beneath the surface (I cannot make out any trace of a hair in the bump)? If it is, what is the best course of action?