What should I do with a fibroadenoma?

Depends. If you are talking about in the breast, there are choices. Some people will watch them (exam and mammograms, etc) or some will opt to have it removed. Remember, ometimes things aren't what they are felt to be....
Depends. This is a benign (not cancerous) mass. If it has been biopsied and proven to be a fibroadenoma, it can remain in your breast. Usually fibroadenomas are excised only if they cause you pain/discomfort or if it is larger than 2 to 3 cm.