Brief Answer:
Most probably related to a hormonal fluctuation

Detailed Answer:
Hello ma'am and welcome.

Thank you for writing to us.

I have gone through your query with diligence and would like you to know that I am here to help. Its good to know that the mammogram returned a normal result, which most likely indicates a hormonal issue here. I would recommend a check on your hormone levels, especially if you have already experienced menopausal symptoms.

Speak to your doctor about your helping you cope with your menopausal symptoms, and I am sure your doctor will see you through this ma'am. In the meantime, wear comfortable clothing and avoid irritating or aggravating the region.

I hope you find my response helpful, please feel free to write back to me for any further clarifications, I am always here to help.

Best wishes.

---