I had a tummy tuck 10 months ago. I’ve had issues with the colour of the skin in the center of my stomach since the procedure (area circled in pic). When I work out or shower, this area is very noticeably darker than the rest of my skin (seems to be related to heat). I’ve recently started tanning and the same area will not tan as much as the rest of my skin, which is fairly noticeable in the pic. What is going on? Will this improve?