What is this big hump black purple / wound?

I took this very hard painful lump on my back which is purple and black on top and I do know what it is. I got this some time back, then released and blood and pus started coming out of it. What could it be and how Can I prevent that from happening again? I take 2 showers a day, so Im a very clean person. In addition, the last time I have done what he was not in the same place.

It's probably a keratin cyst rupture, which sounds as though it remains to be seen and treated by your dermatologist, in order to completely remove the cyst and inflammation.

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