Hi, Nipples discharge is usually benign and commonly It may be sign of certain hormonal or infectious issues. When you often palpate nipples, it stimulates hormones and can indicate breast discharge. Moreover when you often check your nipples, it may cause some inflammation and give soreness in it. To ease your mind and to make sure no cancer, cyst or abscess in the sore breast is present, please have an ultrasound of this breast done. If you have fever, an inflammation can be the reason. If you have constipation, tiredness,hypothyroidism should be considered and TSH checked. If the discharge will be still present, you should have prolactine level checked which is common cause of this. Hope this will help. Feel free to ask further questions. Wish you good health. Regards, Dr. Ivan R. Rommstein, General Surgeon