Don't stick anything in it. If it drained by itself that's good.
Epsom salt soaks and a warm compress will help. If it gets any worse you need antibiotics, like bactrim.
That is an abscess. It will spread to your lymph nodes next, be careful.
Take a heating pad and a moist towel soaked in epsom salt solution and put it over it for a couple hours a day. It looks like you'll have a big white plug fall out of it then just keep it clean and dry and it'll heal with a big purple scar right there...
That's all I got. If you get red streaks or swelling lymph nodes you need antibiotics immediately before you need even more escalated treatment.