Dermatology and skin care are plagued by trendy terms that either slap a new name on an old concept or simply turn out to be nonsense .

But some dermatology buzzwords are based in real science, Dr. Marnie Nussbaum, board-certified dermatologist, explained in a segment on the TODAY show. And many of them refer to procedures that can easily be performed at home.

Phototherapy

Phototherapy, or light therapy, involves the use of specific wavelengths of light to manage skin conditions. Right now, red and blue light are the most buzzy types of light therapy, Nussbaum says.

While blue light is helpful in keeping acne-causing bacteria under control, she explains, red light is able to penetrate deeper into the skin. That means red light has more potential in managing inflammation and stimu

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