While it may be scary to feel or learn you have a lump in your breast, it could just be a cyst. A breast cyst is a fluid-filled sac that forms in the duct system behind your nipple. A cyst is typically noncancerous and doesn’t require treatment unless it bothers you. Breast cysts are most common in women between 35 and 50 years old.
Types of breast cysts
Cysts can vary in size. Microcysts are so small they are undetectable. A macrocysts can feel like a grape or small water balloon. It is also very common to have multiple breast cysts at the same time.
There are three different types of breast cysts.