"Stingling feels like a mild prickling sensation, which makes the skin look and feel a bit flushed," says Rouleau, who is also the founder of an eponymous skin-care line. "While it will go away on its own, it takes about 10 seconds to do so, which is about double the time of a tingling sensation."
- Renée Rouleau, esthetician and founder of Renée Rouleau Skincare
She explains that stingling is most likely to occur when you use exfoliating acids like alpha-hydroxy acids (AHAs) or beta-hydroxy acids (BHAs). When it happens within this context, it's a good thing. "This includes glycolic, lactic, malic, or salicylic acid," says Rouleau. "They work by lowering the skin’s pH, so a stingle can be expected as they do so."
Know that as you get used to these ingredients, the stingling may go away. Take that as a good sign. "Sometimes an acid product that stingles at first use will go away over time," she says. "This is because exfoliating acids help to repair the skin barrier, so as it becomes stronger, you’ll feel less of a sting. Never fall prey to the common myth that 'if you don’t feel it, it’s not working.'"
Sometimes, though, your skin care can stingle for not-so-great reasons. "The product might not agree with your skin, which could be because of an irritating ingredient," says Rouleau. "Products can also stingle when you have a compromised skin barrier, as they are getting closer to the deeper layer of skin." In those cases, you may want to lower the amount of product you apply or how often you apply it so your skin can get used to it. But if you apply a product and feel more than a single, it may not be a current fit for your skin.
"If you’re reaching the stinging or burning level, the prickling sensation will feel more severe and can last for more than a minute," says Rouleau. "You may also notice other symptoms, such as redness. Sometimes it will go away on its own, but often when it’s more than a stingle, you must wash off whatever product was applied that caused the reaction."
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