Out of the blue, the day before yesterday, I noticed bloodstains on the inside of my bra. They were very light. I checked my left breast and noticed brownish discharge coming from the nipple. I showered and in the shower, there was more discharge. Red. I am about to get my period in a couple of days. I'm 33 and in good health, or so I thought. No allergies, no medications, no smoking, no alcohol. I am concerned about the bloody, brownish discharge from my left nipple. Breasts are currently tender because of my cycle. My friend's toddler was roughhousing with me three nights ago and kicked me in left breast. The next day it itched and I rubbed it to relieve the itch and I felt sharp pain. I also had an abnormal mammogram about a year ago due to a large mass in that breast, but it turned out to be benign fibrocystic tissue i believe it is called. I nursed my daughter and they believe it may related to the ducts. What could this be? How can I tell if it is possibly cancer? Thank you.