It's most likely a breast bud. If she's 8, they won't really do anything about it because it falls into the normal puberty age range (which starts at 8). My daughter had a breast bud and body odor at 7. When I took her in THEN, they docs all freaked out and did a bone age test on her to make sure she didn't start early puberty, etc. Then when she was 8, I asked them again because she seemed to be developing so rapidly. But they said, no no it's completely normal at 8. So at 7 they freak out, but at 8 it's considered normal. As it turns out, my daughter wasn't starting early puberty, although now at 10, she has hair everywhere, actual breasts, her period, is FULLY going through puberty. It runs in our family on both sides, so we're not really concerned at all. I would certainly touch base with her doctor and see if they're concerned. But most likely it's nothing to worry about.