Sun exposure, hormones, pregnancy, acne and inflammation can all leave skin darker in some places than others. That uneven darkening is called hyperpigmentation, and for decades one ingredient has been the benchmark for treating it: hydroquinone.
It works well. It also comes with rules about how it is used and sold that changed in recent years, and plenty of older advice online has not caught up.
What Hydroquinone Does
Hydroquinone is a tyrosinase inhibitor. Tyrosinase is the enzyme your skin needs to produce melanin, the pigment behind freckles, age spots and melasma. By slowing that enzyme, hydroquinone reduces how much new pigment the skin makes, and existing dark areas gradually fade as the skin turns over.
It is sometimes described as bleaching the skin. It does not. It returns overactive areas toward your natural baseline tone. If you want to know what that baseline is, look at skin that rarely sees the sun, such as the underside of your forearm.
What It Treats
- Age spots and sun spots
- Freckles
- Melasma
- Post-inflammatory hyperpigmentation, the dark marks left behind after acne
It will not help discoloration caused by active breakouts, or deep, indented acne scars, which are damage to the deeper dermis rather than pigment.
How It Is Sold Now
This is the part older articles get wrong. For years, lower-strength hydroquinone creams were sold over the counter at around 2%. Under the CARES Act, the FDA determined that over-the-counter hydroquinone was not generally recognized as safe and effective, and from September 2020 over-the-counter hydroquinone skin-lightening products could no longer be legally sold in the United States.
Hydroquinone is now a prescription ingredient. That is not a bad thing. It means it is used with a provider who can judge the right strength and duration for your skin and watch for problems. Ask us at your consultation which options are right for you.
How to Use It
For moderate to severe pigment, hydroquinone is typically applied twice a day, roughly twelve hours apart. In the morning it goes on after cleansing and any serum, before moisturizer and sunscreen. In the evening it goes on after cleansing and any retinoid, before a heavier moisturizer.
Most people see pigment start to fade after about four weeks of consistent use, with the best results after a few months. Apply it across the whole area rather than dotting it onto individual spots, so the tone evens out rather than leaving pale patches around darker ones. Spot treatment makes sense on larger body areas or on skin that irritates easily.
Once your pigment is where you want it, your provider may reduce how often you use it, or switch you to a gentler tyrosinase inhibitor such as kojic acid for maintenance.
Who Should Not Use It
- Anyone who is pregnant or breastfeeding
- Children
- Anyone with a known sensitivity to it
Side Effects
Dryness, redness and mild stinging are the most common, and usually settle within a few weeks. Because hydroquinone interferes with how skin produces melanin, it also makes skin more vulnerable to sun damage, which is why daily sunscreen is non-negotiable while you use it. Any unprotected sun exposure simply switches pigment production back on.
A rare condition called ochronosis, in which the skin darkens instead of lightening, has been reported, more often with long-term use of high concentrations. It is one of the reasons hydroquinone belongs under a provider’s supervision rather than in a medicine cabinet.
If your product turns brown, it has oxidized and stopped working. Throw it away.
What It Works Best With
Hydroquinone is strongest as part of a routine: a vitamin C serum in the morning, a retinoid at night, and broad-spectrum sunscreen every single day. Hats and sun-protective clothing help too, especially through a Charleston summer.
If You Would Rather Avoid It
Some people dislike the feel of hydroquinone, react to it, or simply prefer not to use it. Hydroquinone-free brighteners exist and can help, though for stubborn pigment they rarely match its results. Your provider can recommend one.
Combining It With In-Office Treatment
Topicals and in-office treatments work best together. A chemical peel or laser resurfacing removes pigment that is already there, while hydroquinone helps stop new pigment forming between sessions. For the full picture, see our guide to repairing sun damage.
Book a Consultation
Well Labs+ Medspa Charleston, 1470 Tobias Gadson Blvd, Suite 100A, West Ashley. Call (843) 405-5906 or meet the team before you book.
Also Read: How 9 Non-Surgical Anti-Aging Treatments Lead to Youthful Looking Skin
