Painful bump under arm help!?

There is a large firm bump under my arm. When I say firm. It doesn’t move when I touch it. It hurts when I move my arm as well. Any ideas on what it could be? It came all of a sudden and I’m scared because cancer runs in my family. And just s bump caused my moms cancer. I know I may be jumping to conclusions with... show more There is a large firm bump under my arm.
When I say firm. It doesn’t move when I touch it. It hurts when I move my arm as well. Any ideas on what it could be? It came all of a sudden and I’m scared because cancer runs in my family. And just s bump caused my moms cancer. I know I may be jumping to conclusions with it but I can’t help but wonder considering my mom and other people in my family
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