We think of dead skin cells as the enemy, but they do serve a purpose, says Gold. What does the skin you don't slough off do? It shields your complexion from environmental pollutants and bacteria. Rather than scrubbing daily, you should only exfoliate once every two weeks, Gold says.

Graf also points out that it's not just how often you exfoliate, but the type of exfoliator you're using that also matters. She recommends avoiding face scrubs because "the sharp edges of the particles in some scrubs made from apricot pits and walnut shells can injure the skin." Instead, try chemical exfoliants (like alpha hydroxy, glycolic, or lactic acid) or more gentle scrubs made from rice or synthetic beads. Graff says to look for products that say they are gentle enough for daily use (but you should still only use them every two weeks). Chemical exfoliants may give you a slight tingly feeling, but if you're ending up with red or irritated skin, the product is too intense and you should try something gentler (look for lower concentrations of the active ingredients).

The truth: Gold says these ingredients are for everyone. Or at least, everyone who wants help with acne, wrinkles, pore size, skin care prevention, or skin tone (so, as we said, everyone).

Gold adds that retinol has been around for close to 50 years and has a ton of research to prove its safeness. So rather than jumping from fad ingredient to fad ingredient, he recommends sticking with tried and true retinol to fix almost any skin issue.

There are a few things wrong with this rule. First, Graf says that "oil-free" isn't even a regulated term. Essentially, a brand could slap it on almost any product, so it's no guarantee that you won't get zits.

Second reason to ignore this label: Even the oiliest skin needs moisture, says Bayati. Skipping oil can lead to skin that's chronically dry, which is when skin starts to produce more oil.

Finally, Spunt and O'Connor say all skin actually needs oil -- as long as it's the right type. "We've been told to avoid oils, but there are some, like argan and coconut oil, that are skin compatible, absorb well, and even work [to prevent] acne," they say. "[These oils] have antibacterial properties and can help balance the skin." So while it may seem strange to slather on some lavender or argan oil over your broken-out skin, it may just do the trick.

If you suffer from acne, your routine probably involves using a benzoyl peroxide or salicylic acid spot treatment on any blemishes that pop up. But there's good reason to re-think that advice.

Spunt and O'Connor point out that these ingredients are harsh, irritating, and drying for almost everyone. So while they may kill bacteria and eventually get rid of your zit, they can also leave you with red, flaky skin that's practically impossible to cover with concealer. A better solution? "Try gentler products like willow bark and clay to calm inflammation and draw out impurities," Spunt says. "Gentler products can still fight pimples, and do so without drying your skin and making it look worse during the process."

Eye cream seems like such a no-brainer part of your skin care regimen, right? But in most cases, you can skip it, says Gold.

"If the eye cream actually has specific ingredients that you need for your eyes, [like retinol or growth factors] then go ahead and use it," he says. "But in general you can just use your face creams on your eye area. Some eye creams are basically the same products anyway in different packaging." So there's really no need to spend more money; instead just dab some of your moisturizer and face serums around your eye area as well.