Nipple discharge. Usually more scary than dangerous.
D001943:Breast Neoplasms / Q000378:metabolism; D005122:Exudates and Transudates / Q000378:metabolism; D005260:Female; D006801:Humans; D009558:Nipples / Q000378:metabolism*; D010144:Paget's Disease, Mammary / Q000378:metabolism; D018300:Papilloma, Intraductal / Q000378:metabolism