Although the bloody discharge may resolve on its own, this situation requires evaluation with an ultrasound of the area behind the nipple and areola.
Curr Treat Options Oncol. 2002 Apr;3(2):157-61. Management of bloody nipple discharge. Vargas HI(1), Romero L, Chlebowski RT. Author information.
Bloody nipple discharge is never normal. Other signs of abnormality include nipple discharge from only one breast and discharge that occurs.