My daughter will be turning 12 in about a week and has just informed me that she has a small lump on her left breast that is tender. I did feel the lump. It is not visible with the naked eye. She has not menstruated yet, and has no breast development to date. I am assuming it is the beginning of puberty for her, but am concerned...should I make an appointment just to be safe? Any advice would be greatly appreciated! Thank you!