Hello XXXXXXXX,
I really don't want to alarm you, however, the fact that this lump has no pain is not a good sign. It's probably nothing but an infection in your breast, but it is possible for breast cancer to present this way. You need to see your doctor fairly soon for an exam, and some testing.
Nurse (RN)
35+ yrs skilled nursing experience; Dir of Nursing Skilled Nursing/Rehab; Elder Care Consultant