Habit: Putting On Moisturizer Morning, Noon, And Night

While keeping your skin hydrated is important, according to dermatologist Dr. Rebecca Baxt, you don't need to do it repeatedly if you have oily skin. "So many women think that they must moisturize their face every night, but that's not true if you have oily skin," she says.

"I find lots of patients, despite the fact that they have oily skin, have been told they need to moisturize every night to prevent wrinkles, and they do this, and their skin gets oilier. If your skin is naturally oily, you don't need to add to the oil with emollients." Her solution? Use a moisturizer by day and a drying product with ingredients like benzoyl peroxide or salicylic acid at night.

Photo: Jamie Grill/Corbis