I suggest you see your primary care doctor for advice.
I went to the ER lastnight and was told this morning after a sonogram that the area was at my lymphoid and that it is an infection from an ingrown hair. I was given two prescription s and told that I may need to have it lanced and drain if a pimple were to show up. Right now it's just swollen. This is somewhat a relief because I've never had anything like this happen before and after reading some of the stories I started to believe that maybe it was cancer. It all happened within 3 days. Scarey...... From a knot the size of a pea to a baseball size knot in three days.