Please help what is this? What do I do?

[Charmtaste]

I have developed a lump on my back, where the top of my jeans are. It is incredibly painful and getting more red and more painful by the day. It is hot to touch. My DH squeezed it two days ago and since then it has been far more painful. Lots of pus came out when he squeezed it.
Help, what should I do?

I would ring GP in the morning and try to get antibiotics.

Here is the latest picture

Here is the latest picture. It is getting worse.

Looks like a boil. Def one for the GP, they're nasty if they get infected.

That looks like it’s got 4 little heads on it. Try a hot flannel, with water as hot as you can stand on it. Put it on it and it might draw some more gunk out.