Re: hard, bb-sized lump under 11 yr. old daughter's skin
Has she started her cycles yet? This also happens about the week before one has their period.. It is the activation or swelling of a gland. If your daughter has started her cycles it wouldn't hurt to take her to a female OB and get her introduced to the whole ordeal early. I had issues with my cycles and was on BC's early as a result. Now because I am a naturally large busted women with lumpy breasts (fibrocystic disease of the breast) I have been having to have mamograms yearly since I was 29 to keep an eye on things.
60% of women have a degree of this and suffers have lower incidences of breast cancer. Given your daughter's age I would suspect she is about to hit puberty and grow in all the expected places.. and start her cycle if she hasn't already. An OB-Gyn would be able to talk to her and alieve any fears you have after a physical examination.
If we learn by our mistakes, I am working on one hell of an education.