Tenderness in L breast in nipple/areola area. It seems to flare before period. Concerned it's only in 1 breast. Normal mammo 7m ago. 38 years old.

Prob nothing bad. . Especially since it seems to come and go. The fact that it flares with your period is also reassuring in that cancers don't usually 'flare' , they just keep growing steadily. Have you seen a surgeon. ? If not get in to see one for evaluation. A biopsy will confirm the area is benign. .