First, check with the place where you are having the mammogram for any special things you may need to do before you go. Here are some general guidelines to follow:
If you still have menstrual periods, make your mammogram appointment for one week after your period. Your breasts are less tender after your period.
Wear a shirt with shorts, pants, or a skirt. That way you can undress from the waist up and leave your shorts, pants, or skirt on when you get your mammogram
Don't wear any deodorant, perfume, lotion, or powder under your arms or on your breasts on the day of your mammogram appointment. These substances can make shadows show up on your mammogram.