Possibly, but unlikely. Most cases of nipple discharge are benign (not cancer). Benign discharge tends to be nonbloody, could be milky, brown, blue, green, gray, or clear. Could be due to abnormal hormone levels, trauma, recent breastfeeding, medications, or an underlying medical condition. Any discharge that is spontaneous, comes from one breast only, or bloody is concerning. Cancer is the cause of nipple discharge in only 5 to 10 percent of cases. I strongly recommend a doctor’s appointment for a proper check up. Don’t try to figure this one out by yourself!