Our expert says:
If she is 10 years old it could be part of normal breast development (breast buds) and highly unlikely to be cancer. Under no circumstances should the lump be cut out unless 100% proven to be cancer, which I am almost sure it is not. Cutting out a lump in a little girls breast has the same effect as a mastectomy in an adult and can cause permanent disfigurement. If needed, get more than one opinion. See http://life.familyeducation.com/puberty/growth-and-development/40471.html
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