Answer: Fibroadenomas tend to occur in younger women, up to the age of thirty, although we can see them at any age. They are often oval, smooth and easy to move around in the breast. Normal gland tissue in the breast has been likened to a scaled down packet of frozen peas, as it has a nodular feel to it. In the same way that sometimes frozen peas clump together to form a lump, so gland tissue in the breast can also clump. Fibroadenomas can be thought of as normal breast tissue, stuck together. They are harmless.
See full article by Consultant Breast Expert, Mr Simon Marsh: Breast lumps