The masks generally come with two main light options—red light and blue light—thought some also offer amber, green, yellow, and white light wavelengths, depending on the price point of the mask.

EXCLUSIVE: Great news for Blue Bloods fans — one of the beloved drama’s signature characters, Donnie Wahlberg’s Danny Reagan, will be back on CBS with a new ‘Blue’ cop show in a new city.

Available in several shades, this lip stain has garnered a ton of attention because of its blue tint. Now, if you haven't seen this product in action — once the blue mask is peeled away, it's supposed ...