Hey guys, I'm using the MacBook Pro 15-inch late 2016 for about three month. The version of the operating system I'm currently using is macOS Sierra 10.12.4. Recently, I found several reflective spots on the left side of the escape key (just as the circle I marked in the picture attached shows). The spots are on the black area (the leftmost area) of touch bar which it won't lighten up as the touch panel. Though it didn't cause any malfunction of touch bar so far, this strange reflective spots annoy and confuse me a lot. Can anyone tell me what cause this problem?Am I the only one who has this problem? Please help me! Thanks a lot!