Looks like post inflammatory hyperpigmentation to me.
Which would mean itwill fade completely with enough time.
Indeed. In addition - and independent from that - two months after a full clearance there are also new hairs starting to form under the skin. That can make a dark shadow as well, and the color is not a light brown as in hyperpigmentation but blueish/greyish. That was the case with my own facial hairs as long as they were many.