Breast pain?

Amber

Okay, so I have pain in my right breast like below the nipple. The pain is like a sore/tender pain almost like after you’ve worn a push-up bra all day and take it off at the end of the day, and feel that tenderness after it’s off, but it’s constant. There isn’t any lump and when I massage it milk does come out,but what could the soreness be?? It’s bearable- but if there is someway to stop it I’d rather do that.