However, because of the risk of cancer, see your doctor to evaluate any lump or suspicious mass or lump. These changes can cause your breasts to feel granular. They're typically harmless. These fluid-filled sacs occur most often in women ages 35 to 50. Cysts often enlarge and become tender just before your period, when your body retains more fluid.
Some cysts are tiny, but others can be as large as an egg.
If pressed, large cysts may change shape slightly, and you can move them under your skin. A fibroadenoma has a firm, smooth, rubbery feeling and a well-defined shape. You can move it under your skin. Perform this exam 7 to 10 days after the beginning of your last period. If you're past menopause, post a reminder to examine your breasts on the same day each month.