[Acne] I have a hard acne bump that won't pop.

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It seemed to start out as a deep pimple, felt like a huge bruise. I eventually "popped" it but didn't get any pus, only blood/plasma. It doesn't hurt anymore, but it feels like a huge hard cyst. There's something in there. I used a needle earlier to poke a few holes and only blood came gushing out. I thought maybe it was a pocket full of blood instead of pus since the blood eventually stopped when I pressed on it & only had plasma. How do I get rid of it? Is it even a pimple? I tried to take a picture, but it's too blurry. Thanks for any advice!
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Submitted by JealousSherbet