On the other hand, intraductal papilloma is a small, usually noncancerous growth that projects into a milk duct near the
nipple. A blunt trauma — can cause
nipple discharge in both breasts. While paget's disease of the breast is uncommon and presents with itching, burning, redness or scaling of the nipple and areola. You can read more about this through this link:
http://www.mayoclinic.com/health/nipple-discharge/WO00093
Take care and regards.