I'm 30 years old & last night I recently discovered a small, painful lump on my left underarm. About a week ago, I experienced a dull burning sensation in both underarms & breasts. The burning sensation went away after that day. Now after discovering my lump (late at night in the shower), the burning sensation returned & feels worse. I also feel like it's burning in between my shoulder blades & sometimes both nipples. As I am typing this it's like burning became dull again. So I guess it comes & goes? I hope that I made sense. I'm scared to death that this is breast cancer. Can someone give me some insight/advice? Thanks.