My daughter, who is 10 years old, just came to me this morning complaining of pain when she presses on her right nipple. It has a lump that is hard. (Her left nipple is soft.) She is not in puberty yet and I am very concerned. I have a history of cancer in my family. I plan on calling our doctor tomorrow for an appointment, but I'm just wondering if you can share your thoughts on what could be causing this.