I have a lump in my uner arm, it hurts and pust comes out of it. what is it?!

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Sounds like a pimple. It's normal. Pimples can form dam near anywhere u can sweat. So thtat means anywhere

put warm, wet compresses on it. It should come to a head and then you can drain it. Might take a couple of days.

It could be an ingrown or infected hair follicle.
Get it checked out or the infection will travel through your body and make you sick.

Probably a ingrown hair. Put some alcohol on it so it won't get infected. If it don't go away. See a doc.