Is this a boil or something more??

Ive had this 'boil' for about 5 days now, the skin underneath is really really hard and i cant draw much poison out when i try! it hasnt really came to a head so to speak but is more of a crater with a pool of puss so its making me think this is something different to a boil?? i had something identical about 6 weeks ago which has left a fairly bad mark on the same bum cheek any help would be appreciated thank you!

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It’s just a boil.

Here’s some excellent advice from American Association of Dermatology if you’re interested

BW,
Adhari