I Have A Boil (I Think) Its Been 'off And

I have a boil (I think) its been 'off and on' for a few months - it often kind of goes down then comes back a few weeks later. It swells then fills, gets sore, then bursts. Usually clear fluid but sometimes a little pink as it empties....with some blood. Then I am trouble free for a few weeks until it flares up again.....any advice?