Hi, Im having issues with this big bump on the side of my right balls.

This bump comes back every once in 3-5 months.
Its always on the same spot.
Yes I am well clean, I have no partner.

The bump came just 1 week ago, it enlarged to the size of my complete thumb's nail.
Just now, there was a dark spot at the tip of the bump.
Usually that tells me that its about to let loose the pus.
Well this time, the very second I applied soft pressure to it,
good god pus and blood just squirted on my hands, it took me 30 minutes to completely drain the thing, I then cleaned it with a shower.
It didnt hurt when the pus came out but it hurts when I have to walk with it.
I had to apply a bandaid and cotton so the pain would be less of an annoyance.
Im not really freaked out because its happened 2-3 times in the course of 3 years.
but the one just now with the squirting sorta has me wondering what I did to make it come back.