I can't really help you with the legal issues as I'm not from the US, but, as others have mentioned bear in mind these days many cancerous lumps can be removed

I can't really help you with the legal issues as I'm not from the US, but, as others have mentioned bear in mind these days many cancerous lumps can be removed with non-that-intrusive local surgery. So, be positive! If that's the case then the positive is that you've found about it while you're very young and doesn't have expanded! Moreover, if that's the case and there is a good outcome, then you've been blessed with something that many others like me discover on their late thirties, fourties or fifties. To appreciate life and enjoy every minute of it. Good luck.