Melasma is not the same as hyperpigmentation, but it is one specific type of hyperpigmentation. Hyperpigmentation is a broad umbrella term for any patch of skin that becomes darker than the surrounding area. Melasma is a particular pattern of hyperpigmentation with distinct triggers, a characteristic appearance, and its own treatment challenges. Think of it like the relationship between “fruit” and “apple”: all melasma is hyperpigmentation, but not all hyperpigmentation is melasma.
What Hyperpigmentation Actually Means
Hyperpigmentation simply describes skin that has produced excess pigment in a localized area. It can show up as a single dark spot, a scattering of freckles, or broad patches across the body. The underlying process is the same in every case: pigment-producing cells either make too much melanin or deposit it unevenly in the skin’s layers.
The most common forms of hyperpigmentation include sun spots (sometimes called age spots or liver spots), post-inflammatory hyperpigmentation (dark marks left behind after acne, eczema, burns, or other skin injuries), and melasma. Each type has different causes, looks different on the skin, and responds to different treatments. Lumping them all together as “hyperpigmentation” can lead to frustration when a product that fades one type does nothing for another.
What Makes Melasma Different
Melasma stands apart from other forms of hyperpigmentation in three key ways: its triggers, its pattern, and its stubbornness.
The most recognizable feature is symmetry. Melasma appears as matching patches on both sides of the face, most commonly across the cheeks, forehead, bridge of the nose, chin, and upper lip. This is why it’s sometimes called “the mask of pregnancy.” Sun spots, by contrast, appear wherever UV exposure has been heaviest and don’t follow a symmetrical pattern. Post-inflammatory marks show up exactly where the injury or breakout happened, regardless of symmetry.
Melasma’s triggers are also unique. Hormonal fluctuations play a central role. Pregnancy, starting or stopping birth control pills, and hormone replacement therapy can all set it off. The sun doesn’t just contribute; it’s the single biggest factor that pushes melasma from invisible to visible. Even someone with an underlying hormonal predisposition may never notice patches until they spend extended time in the sun. Heat and visible light (not just UV rays) can also worsen it, which means sitting near a sunny window or spending time in front of a hot oven can trigger flares.
Genetics matter too. Melasma frequently runs in families and is most common in people with medium to olive skin tones, particularly those with Fitzpatrick skin types III and IV. Women are far more likely to develop it than men.
How Post-Inflammatory Marks Compare
Post-inflammatory hyperpigmentation, or PIH, is probably the type most often confused with melasma because both can appear on the face as dark patches. But the cause is completely different. PIH occurs after some kind of skin injury or inflammation: a pimple, an eczema flare, a burn, an aggressive cosmetic procedure, or even habitual picking. The inflammation triggers nearby pigment cells to dump excess melanin into the surrounding skin.
The practical difference matters for treatment. PIH tends to fade on its own over months, especially with consistent sun protection. Melasma rarely resolves without active treatment and has a strong tendency to return even after successful clearing.
Why Pigment Depth Matters
Both melasma and other forms of hyperpigmentation can deposit excess pigment at different depths in the skin. Pigment sitting in the upper layers of skin (the epidermis) looks brown or dark brown. Pigment trapped deeper in the skin (the dermis) appears more grey-blue. Some people have both at once.
Dermatologists use a special ultraviolet lamp called a Wood’s lamp to figure out where the pigment sits. Under this light, pigment in the upper skin layers looks sharply defined and darkens dramatically, while deeper pigment barely changes and appears grey-blue. This distinction shapes treatment decisions because topical creams work best on surface-level pigment, while deeper pigment is harder to reach and slower to respond.
Treatment Differences
General hyperpigmentation from sun damage or post-inflammatory marks often responds well to over-the-counter brightening ingredients, chemical exfoliants, and consistent sunscreen use. Many of these dark spots fade substantially within a few months.
Melasma is a different story. The current standard treatment is a prescription triple combination cream that contains three active ingredients: a retinoid to increase skin cell turnover, a mild anti-inflammatory to calm the skin, and a pigment-evening agent to reduce melanin production. In the United States, the pigment-evening component (hydroquinone) now requires a prescription. Some dermatologists prescribe these ingredients separately or in different combinations depending on how your skin responds.
A newer option gaining traction is tranexamic acid, which works by interrupting the signals that tell pigment cells to overproduce melanin. A meta-analysis published in Acta Dermato-Venereologica found that oral tranexamic acid produced significant improvements in melasma severity scores, and adding it to standard treatments improved results further. It can be taken by mouth, applied topically, or injected into the skin, though the oral form showed the strongest effect in pooled data.
Laser treatments can also break up pigment in melasma, but they carry a real risk of making things worse or triggering rebound darkening, so they’re typically reserved for cases that haven’t responded to other approaches.
Why Melasma Keeps Coming Back
One of the most frustrating aspects of melasma is its tendency to relapse. There is currently no cure. Even after successful treatment that clears patches significantly, frequent relapses are common. Any of the original triggers (sun, heat, hormonal shifts) can reactivate pigment production in the same areas.
Long-term management makes a bigger difference than any single treatment course. That means daily broad-spectrum sunscreen, ideally a tinted formula containing iron oxide, which blocks visible light in addition to UVA and UVB rays. Standard sunscreens don’t block visible light, and studies have shown that visible light alone can trigger melasma flares. This is also why sun exposure through car windows and office windows can be a problem: visible light passes through glass even when UV is partially blocked.
Avoiding peak sun hours between 10 a.m. and 4 p.m., wearing wide-brimmed hats, and reconsidering hormonal medications when alternatives exist are all practical steps that reduce the chance of recurrence. For many people with melasma, maintenance treatment with a lower-strength prescription cream becomes part of an ongoing routine rather than a one-time fix.