I had the same experience. I look white in the mirror, but it's dark when I hold my mobile phone. . Very speechless, I thought it was something wrong with my eyes. I asked a friend who specializes in photography and said it was because of the pixel problem. Generally, there are not enough pixels (even the highest pixel of the mobile phone is not too high) and there is not enough light to show it, so the skin color is yellow. . Acne is more obvious on yellow skin. . So don't worry, I'm actually fine.