A breast lump such as you describe could be any number of things; at your age it's unlikely to be breast cancer, but you still need to keep the possibility in mind. Wait a couple of weeks or so; if the lump doesn't disappear, say, within a month (or definitely if it seems to be getting larger/painful), then call your doctor, describe your symptoms, and see what s/he says. You may need some diagnostic testing to figure out what it is and get it taken care of. Good luck - PJH
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