Merck Manual

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How to Do a Breast Self-Examination (1)
How to Do a Breast Self-Examination (1)
How to Do a Breast Self-Examination (1)

1. While standing in front of a mirror, look at the breasts. The breasts normally differ slightly in size. Look for changes in the size difference between the breasts and changes in the nipple, such as turning inward (an inverted nipple) or a discharge. Look for puckering or dimpling.