This info is from UC Health:
"Finding a lump in your breast can be scary, but it doesn't necessarily mean you have breast cancer. Lumps can come in a variety of shapes and sizes, as shown in this video. If you are unsure whether a lump should be tested, visit UCHealth or your health care provider for a breast cancer screening test. A mammography screening test is very important to your overall health and should be performed annually. The comparisons of breast cancer lumps in this video serve as a reminder to get screened. Breast cancer screening is important for all women and helps to detect breast cancer early, when the chances of survival are highest.