Merck Manual

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How to Do a Breast Self-Examination (6)
How to Do a Breast Self-Examination (6)
How to Do a Breast Self-Examination (6)

6. Lie flat on the back with a pillow or folded towel under the left shoulder and with the left arm overhead. This position flattens the breast and makes it easier to examine. Examine the breast as in steps 4 and 5. Repeat for the right breast.