Do u have family history of breast Ca? Do u have done self breast exam ? Do u have found any nodule , lump ? Is there any change in size and texture of nipple/ areola ? Or change in skin texture. It can be early signs , including any watery discharge from nipples and should not ne ignored. Tenderness can be due to underlying abscess/pus or infection.do u have fever or any other complaints or on any other harmonal medications or contraceptive pills.

U need some screening test i.e Mammogram to rule out Breast Cancer. Any Lump in the body should be properly screened for malignancy

Need mammogram to see. Consult a general surgeon

Suggested for Mammography of breast if required FNAC also