Join Date: Apr 2006
Location: Atlantic Canada
Mentioned: 29 Post(s)
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This is totally anecdotal, but that's how it happened for me. I was 10, and barely 10, and thin (although, not as thin as your dd!), and I distinctly remember that I started out with a nickel-sized lump under only one nipple. I could shift it around a bit under the skin, but it didn't really hurt. Sort of like how if you extend and relax your knee, you can shift your kneecap a bit. My mom was concerned enough to get me to show my nurse grandmother, who was completely unconcerned.
Things did even out within a reasonable period of time (a month or two, I think). I had big breasts for my age, but they were never lopsided (well, not until pregnancy/breastfeeding!), and never grew beyond an A cup, or a very ambitious B in certain brands.
Is her lump painful? If it's not painful, or red, or oozing anything, or otherwise showing signs of infection or other oddness, I'd probably just keep an eye on things and wait until your scheduled apt to ask about it. Unless *she's* freaking out about it and you aren't able to reassure her.
For greater things are yet to come...