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. Consult

It is not uncommon Usually due to pressure effects

Nothing to worry, can apply prime rose oil