Maybe it’s the brightness of a warm summer day. The point is that we generally consider light to be good, safe, even comforting. Yet when it comes to our skin, things are a bit more (maybe a lot more) ...

Under the transparent outer skin are two cell layers that contain red and yellow pigments, or chromatophores. Below the chromatophores are cell layers that reflect blue and white light.

A sun rash is an immune system reaction to sunlight exposure that causes itchy bumps, raised patches, or blisters on your ...