Hi,My sister says she has a small, purple, pimple sized lump on her breast, near her nipple. She says it was a spot but then turned into this itchy purple lump that she has now. It doesn t hurt, she s only noticed it fairly recently, I think. She s not sure if it is filled with anything, but She thinks it may be. Do you think it s anything to be worried about? Thank you for your help in advance.