Salicylic Acid
Salicylic acid is a beta-hydroxy acid (BHA) that's primarily used to treat acne-prone skin. It works by exfoliating the top layer of skin so that pores become, and stay, unclogged. Because of its exfoliating properties, it can cause the skin to be more sensitive. For that reason, it's best to use salicylic acid in the evenings and to always wear a layer of SPF 30 during the day while using salicylic acid, whether it's via cleanser, spot treatment, or mask. Without SPF — especially if you apply salicylic acid during the day and are exposed to the sun — you can experience burns, hyperpigmentation, and even premature aging.
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Benzoyl Peroxide
If you have acne and aren't using salicylic acid as your go-to treatment ingredient, there's a high probability that you're using benzoyl peroxide instead. This acne medication helps with some of the deeper types of pimples versus whiteheads and blackheads, but it can also cause photosensitivity. It's best to use products containing this ingredient at night and to always wear SPF during the day to protect yourself from damage.
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Glycolic Acid
Glycolic acid is an AHA that also acts as an exfoliator. Its primary purpose is to help even out your complexion, improve clarity, and give skin that tell-tale glycolic glow. Like salicylic acid, benzoyl peroxide, and retinol, it's recommended as a night time treatment and should always be paired with SPF the following day.
Glycolic acid is also a very popular ingredient in facials and professional peels. The concentration of glycolic acid for such treatments is even higher than what you'll find in at-home products, so it's best to plan accordingly. In other words, don't get a glycolic peel the day before you go on a beach vacation, and do your best to steer clear of the sun the day-of and to reapply SPF religiously.
"Sunscreen then needs to be reapplied at least every two hours to provide you with protection," reminds Dr. Wrye.
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Laser Treatments
OK, so laser treatments aren't exactly an ingredient per se, but it's still a treatment worth noting in this list.
"Laser treatments remove the top layers of skin and in some instances can be quite deep," says Dr. Wrye. "Sun exposure to this sensitive new skin should be avoided at all costs since over exposure could cause significant damage and scarring to the skin."
In the same way you wouldn't schedule a glycolic peel the day before a sunny vacay, you also don't want to undergo laser treatments of any kind before spending time in the sun. After any treatment, it's best to slather on SPF regularly and to avoid sun exposure.
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