Some girls feel it's easiest

 

Some girls feel it's easiest to do the feeling part of the BSE in the shower - not only is it convenient, but the soap and water can also help your hands move easily over your breasts. Examine your breasts one at a time. If you're starting with your right breast, raise your right arm, place your right hand behind your head, and use your left hand to feel your breast.
One way to examine your breast is to think of your breast as a circle. Move your fingers in a spiral motion from the outside to the inside of the circle, gradually getting closer to the nipple, noticing what feels normal and what may feel different from the last time you examined your breasts. Use different levels of pressure - light, medium, and firm. This will allow you to feel the various layers of tissue in the breast. Start with light pressure, increase to medium pressure, and finish with firm pressure to feel the deepest tissue. Then put your left arm behind your head and check your left breast the same way.
You can also examine your breasts as you lie on your back on your bed. Use the same method described above, raising one arm and using the other hand to check your breast in a spiral motion. While you're doing the exam, it's a good idea not to take your hand off your breast so you don't miss a spot. You should also check your armpits for any lumps. Girls who have large breasts should also feel their breasts from the side, while lying on one side and then the other.
As you feel your breasts, you may notice lumps or bumps. This is usually normal - just like so many things about people, breasts are unique. Some girls' breasts are large, some are small; some are symmetrical, others are not. Some healthy breasts feel really bumpy, whereas others are less so. Most teens have healthy breasts no matter what they look or feel like. But if you're worried about the way your breasts look or feel, let your doctor know.