I'm so sorry that you, your mom, and your family are having to go through this. It most certainly is scary, but try to trust and believe that everything will work out the way that it is meant to. I'm a strong believer that nothing happens without reason.
That being said, I will keep you and your family in my thoughts and prayers both now and going forward. Good thoughts and hopeful prayers are always important and are infinitely powerful.
I have a good friend that was diagnosed a little overthree years ago with the same thing. She had a mole removed from her foot and was later called by her doctor to report that it was indeed cancerous. In her situation it had spread despite being removed early on, but she is now almost three years cancer-free and is doing well. In fact, she gave birth to healthy twin girls in November.
I don't mean to hijack your post with my story, but I just wanted to let you know that while it is scary, it doesn't always end up badly - there's hope no matter what. Try to remember that and take care of yourself, okay?
Hang in there and try to keep positive...