Hello, Nipples discharge is usually benign and commonly. It may be a 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 a fever, 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 prolactin level checked which is a common cause of this. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Ivan R. Rommstein, General Surgeon