Dark spots on your face are almost always caused by excess melanin, the pigment that gives skin its color. Something triggers your skin cells to produce more melanin than usual in one area, and the result is a flat, darkened patch. The three most common causes are sun damage, hormonal changes, and leftover marks from acne or other skin injuries. Each type looks slightly different and responds to different treatments.
Sunspots (Solar Lentigines)
These are flat, brown patches that develop after years of UV exposure. They show up most often on the face, chest, shoulders, and hands, the areas that get the most sun over a lifetime. You might hear them called age spots or liver spots, though they have nothing to do with your liver. They tend to appear more with age simply because cumulative sun exposure adds up. They’re usually round or oval, uniform in color, and range from light tan to dark brown.
UV radiation drives pigment production in two ways. It directly stimulates the cells that make melanin (melanocytes) to ramp up output, and it generates reactive oxygen species, a type of cellular stress that further accelerates pigment production. Over time, this creates permanent clusters of excess pigment that don’t fade on their own.
Melasma and Hormonal Dark Patches
Melasma looks different from sunspots. It typically appears as larger, blotchy patches on both sides of the face, often across the cheeks, forehead, upper lip, and chin. The symmetry is a hallmark. It’s far more common in women, and hormones are the primary driver. Somewhere between 15% and 56% of pregnant women develop melasma (often called the “mask of pregnancy”), and up to 46% of oral contraceptive users experience it to some degree.
Both estrogen and progesterone play a role. Estrogen binds to receptors on melanocytes and directly turns up the production of pigment-making enzymes. Progesterone takes a different route, triggering oxidative stress in the skin and promoting blood vessel growth that brings inflammatory signals to the area, which in turn stimulates melanocytes to produce more pigment. Melanocytes in melasma-affected skin actually have more hormone receptors than normal skin, making them extra sensitive to hormonal fluctuations. This is why melasma so often flares during pregnancy, while taking birth control, or during hormone replacement therapy.
Sun exposure makes melasma significantly worse, and visible light (not just UV) is part of the problem. This makes melasma particularly stubborn to treat compared to other types of dark spots.
Post-Inflammatory Hyperpigmentation
If you’ve ever had a pimple, bug bite, burn, or patch of eczema leave behind a dark mark long after the original issue healed, that’s post-inflammatory hyperpigmentation, or PIH. When your skin is injured or inflamed, it produces excess melanin as part of the healing response. The spot itself is flat, not raised, and typically matches the shape of whatever caused it.
PIH is more common and more visible in medium to deep skin tones because these skin types have more active melanocytes that respond more aggressively to inflammation. The marks can take months to fade on their own, and sun exposure slows that process considerably.
How to Tell Dark Spots Apart
Location, shape, and your history usually point to the answer. Sunspots are small, well-defined circles or ovals in sun-exposed areas. Melasma forms larger, irregular patches that mirror each other on both sides of your face. PIH shows up exactly where you had a breakout, scratch, or rash.
Your timeline matters too. Sunspots develop gradually over years. Melasma often appears within weeks of a hormonal change. PIH follows days to weeks after skin inflammation.
When a Dark Spot Could Be Serious
Most facial dark spots are harmless, but melanoma (a serious form of skin cancer) can start as a dark spot that mimics a freckle or mole. The National Cancer Institute uses the ABCDE rule to identify warning signs:
- Asymmetry: one half doesn’t match the other
- Border irregularity: edges are ragged, notched, or blurred, with pigment spreading into surrounding skin
- Color variation: a mix of brown, black, tan, white, red, pink, or blue within the same spot
- Diameter: larger than 6 millimeters (about the size of a pencil eraser), though melanomas can be smaller
- Evolving: the spot has changed in size, shape, or color over recent weeks or months
A single one of these features is worth getting checked. If a spot on your face is new, changing, or looks different from your other spots, a dermatologist can evaluate it quickly.
Topical Treatments That Work
Several ingredients can reduce the appearance of dark spots by slowing melanin production. The most effective options target tyrosinase, the key enzyme your skin needs to make pigment.
Hydroquinone has been the standard for decades. At 2% concentration it’s available over the counter in many countries, and stronger formulations (4%) require a prescription. It works well but isn’t meant for long-term continuous use, as it can sometimes cause irritation or, paradoxically, darken skin with prolonged application.
Azelaic acid (typically at 15% to 20%) inhibits tyrosinase and works gradually. It’s generally well tolerated and is a common alternative for people who can’t use hydroquinone or who have acne alongside their dark spots. Retinoids (vitamin A derivatives) speed cell turnover and help pigmented skin cells shed faster, though they can cause dryness and sun sensitivity as your skin adjusts. Vitamin C serums are milder, working as antioxidants that interrupt pigment production, and they pair well with sunscreen for prevention.
Tranexamic acid is a newer option gaining popularity, used both topically and as an oral medication for stubborn melasma. It works through a different pathway than traditional lightening agents, reducing the signals that tell melanocytes to produce pigment in the first place.
No topical treatment works fast. Expect at least 8 to 12 weeks of consistent daily use before you notice meaningful fading.
Professional Treatments
Chemical peels and laser treatments can speed up results beyond what topicals alone achieve. A meta-analysis of clinical trials found that lasers were somewhat more effective than chemical peels at reducing melasma severity, with the advantage of reaching deeper layers of pigment that peels can’t access. Chemical peels work more gradually and typically require multiple sessions.
There are real trade-offs, though. Laser treatments can achieve faster improvement, but recurrence rates reach as high as 40% within six months. And up to 25% of patients treated with certain laser types develop new post-inflammatory hyperpigmentation, with darker-skinned patients being disproportionately affected.
This is an important point for anyone with a deeper skin tone (sometimes described as Fitzpatrick types IV through VI). Darker skin is more susceptible to burns, rebound hyperpigmentation, and scarring from aggressive treatments like intense pulsed light. Not all lasers carry equal risk. Certain wavelengths can bypass surface melanin to target deeper pigment more safely, but the experience of the provider matters enormously. If you have darker skin, look for a dermatologist who regularly treats patients with your skin tone and who uses appropriate technology.
Prevention Makes the Biggest Difference
Sunscreen is the single most important step for both preventing new dark spots and keeping treated spots from coming back. But standard sunscreens only block UV rays, and visible light (the kind that comes from the sun and screens) also triggers pigment production, especially in melasma-prone skin.
Tinted sunscreens solve this problem. They combine mineral UV filters like zinc oxide and titanium dioxide with iron oxides, pigments that create the skin-tone tint. Iron oxide is particularly effective at blocking blue and visible light. If you’re prone to hyperpigmentation, Harvard Health recommends choosing a tinted sunscreen that lists iron oxide in the ingredients. These are widely available and work for any skin tone since manufacturers blend different iron oxide pigments to create a range of shades.
Beyond sunscreen, simple habits help: wearing a wide-brimmed hat outdoors, reapplying sunscreen every two hours during sun exposure, and avoiding picking at acne or other skin injuries to minimize the inflammation that leads to PIH. If you’re on hormonal birth control and noticing melasma, it’s worth discussing alternative contraceptive options with your provider, as the patches often persist as long as the hormonal trigger remains.