Pain in left breast 8 months after augmentation.

Hello! I had breast augmentation about 8 months ago under the muscle, 385 textured, moderate plus profile. I have one spot on the lower left Breast that is still sore. It seems to be more painful in the morning and less noticeable throughout the day. Everything looks perfect and feels totally normal! But for whatever reason that spot is sore! The skin is still a little numb, but I know that's not it because there are other spots that are like that but don't hurt. Any idea why?