These lumps or cysts are fluid-filled sacs that enlarge and become tender and painful before the menstrual cycle. This condition is responsible for at least half of all breast biopsies performed. It tends to involve both breasts. These lumps are movable, and if large may feel round and firm. Cystic disease usually disappears after menopause.
Lipomas develop as single, painless lumps.
They can vary in size. Lipomas consist of fatty tissue and are commonly found elsewhere in the body. Fibroadenomas , single solid tumors, appear most often in young women. They occur twice as often in African American women as in others. These breast lumps are firm, rubbery, movable, often oval-shaped, and usually painless.