Breast reduction. Pain, 3 months post-op. What can I do to reduce the stinging and pain?

I had breast reduction opeartion on 16th May 2018 ( almost 3months). The opeartion itself went really well. I never had any pains. Until few days ago. On my right side, I get a really bad stinging pain. (Feels like one of stitches opened up). Or sometimes sharp pains on both of the breast. The incision lines are red on both side. What can I do to reduce the stinging and pain??. Thanks