To the same point, all of those extra masks and eye and lip treatments they'll ask if you want to add to the base price of the facial aren't always worth it. "If it's simply an application of a product, you might be better off just purchasing the product and applying it yourself," advises Mikesell.

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"Some ingredients are definitely more fad than fab," says Mikesell, who points out that it's all about what can actually penetrate the skin to deliver real benefits. "While being slathered in chocolate certainly smells good, the skin benefits may be nominal. It might feel decadent to experience a 24-karat gold facial, but unless the ingredients are able to penetrate the skin, you're not going to see the results you want," she adds. More specifically, if a treatment calls out precious metals (gold, silver, platinum) or gems, it's absolutely worth inquiring as to what kind of delivery system is used to get them into the skin; otherwise, they can be a total waste of money.

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As a general rule, expect higher -- usually much higher -- prices at luxury resorts, which cater to high-end travelers who often don't think twice about splurging on expensive services, notes Mikesell. "You're paying not only for the treatment, but also for all the amenities that accompany it," she says. If you're OK with missing out on some of those admittedly fun extras (think: that cucumber-infused water and a plush robe), you can often find similarly good treatments at more basic spas for less money.

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More and more spas are now offering medical aesthetic services -- things like laser hair removal, Botox, fillers -- hence the term med spa. But regardless of what kind of spa it is, avoid getting suckered into a seemingly great deal without doing your due diligence. "In most states, these types of medical treatments legally require that either a doctor, physician's assistant or nurse practitioner perform them, not a nurse," notes Alex Theirsch, founder of The American Med Spa Association. Whether you're at a spa where these services cost a little or a lot, it's essential to first ask who is administering them and confirm their credentials before spending any money...and potentially putting your safety at risk.

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It's likely you'll see at least a few different massage options on any given spa menu, all ranging in price. Typically, Swedish massages cost the least, with deep tissue options considered an upgrade. Still, any good masseuse should inquire what kind of pressure you like, so, in theory, you can still get a pretty firm rubdown during a Swedish massage. It may not technically be a deep tissue massage, but it's worth considering this if you want to save a bit of money.

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