Evidence
What the evidence shows
Melasma isn't just a surface-level issue - the pigment can be deposited in different layers of the skin (epidermal, dermal, or mixed), which affects how it looks, how stubborn it is, and how well it responds to treatment.
Are the patches symmetric (both sides of the face)?
Melasma is typically symmetrical. Asymmetric pigmentation may indicate another condition.Did the patches appear during pregnancy or with hormone use?
This strongly suggests melasma, which has a well-established hormonal link.Do the patches worsen with sun exposure?
Sun exposure is the primary trigger - worsening with sun is classic for melasma.
Use this section to decide
Does this advice apply to me?
Find the concern or goal closest to yours, then use the fit signal to decide how much weight to give this guide.If your goal is
Condition typeUse caution- Fit signal
- Limited evidence
Acquired hyperpigmentation
If your goal is
Key featureUse caution- Fit signal
- Limited evidence
Brown facial patches, symmetric
If your goal is
Main triggersDepends- Fit signal
- Possible fit
Sun, hormones, genetics
If your goal is
Who gets itUse caution- Fit signal
- Limited evidence
Mostly women, skin types III-V
If your goal is
Is it dangerous?Usually relevant- Fit signal
- Often useful
No - benign
Research notes already in this guide
- UV radiation is the primary environmental trigger for melasma, with research demonstrating clear links between sun exposure and disease activity.
- Hormonal influences are well-established, with estrogen and progesterone (both endogenous and exogenous) playing key roles.
- Genetic factors are significant, with a substantial proportion of patients reporting family history.
- Recent research has identified vascular changes and inflammatory components in melasma-affected skin, suggesting more complex mechanisms than simple melanocyte hyperactivity.
Expected results
Results and timeframe
The condition is chronic and often relapsing - it can improve with treatment but frequently returns.
Treatment requires a combination of sun protection, topical therapies, and sometimes in-office procedures, with realistic expectations about the timeline for improvement.
Practical use
How to use it
See a board-certified dermatologist
An accurate diagnosis is essential - melasma can look similar to other conditions, and the depth of pigment affects treatment approach.
Start rigorous sun protection immediately
Sun exposure is the main trigger and will undo any treatment progress. Use SPF 50+ daily, reapply every two hours, and wear a wide-brimmed hat.
Discuss treatment options with your dermatologist
Options range from topical creams (hydroquinone, tretinoin, azelaic acid) to chemical peels, laser therapy, and combination approaches. Treatment is typically a marathon, not a sprint.
Safety
Side effects and cautions
- Assuming melasma is a sign of serious illness or cancer
Melasma is benign - it doesn't indicate cancer or any systemic disease.
- Believing melasma will go away quickly with over-the-counter creams
Melasma is chronic and requires consistent, often prescription-strength treatment and strict sun protection.
- Confusing melasma with other pigmentation disorders
Melasma has specific characteristics (symmetry, facial distribution, hormonal link) that distinguish it from freckles, sun spots, and post-inflammatory hyperpigmentation.
Fit
Who should be careful
- Those seeking a self-diagnosis without professional consultation
Helpful context
What else is worth knowing
If you have any of these concerns, start here
Learn what melasma is and whether it might explain your skin changes.
You're pregnant or taking hormonal medicationMelasma is common in pregnancy — understand what to expect and how to manage it.
You've tried fading dark spots without successMelasma is stubborn and needs a specific approach — this guide explains why.
Worth noting
Small details that can change the answer
- Prevalence. Melasma affects up to 50% of pregnant women and is the most common pigmentary disorder seen in dermatology practice.
- Gender Bias. Women represent about 90% of melasma cases, largely due to hormonal influences.
- Skin Tone Link. While anyone can get melasma, it's more common and more visible in people with Fitzpatrick skin types III to V (medium to dark skin tones).
- Triggers Beyond Sun. Heat, visible light (including from screens), and even some skincare products can trigger or worsen melasma.
Melasma is a common, benign condition causing brown or gray-brown patches, primarily on the face.
It's driven by sun exposure and hormonal changes, affects women disproportionately, and is more common in medium to dark skin tones.
Melasma is not a sign of illness or skin cancer and doesn't cause physical symptoms like itching or pain.
Definition
Melasma defined in plain terms
At its most basic level, melasma is simply an area of skin that has become darker than the surrounding skin. The term comes from the Greek word "melas," meaning black. Medically, it's classified as an acquired hypermelanosis - a condition where melanin is produced in excess. The patches are usually well-defined, flat (not raised), and range from light brown to dark brown or even gray-brown. They don't hurt, they don't itch, and they don't flake - they just sit there, quietly, darker than everything around them.
- Typically appears on the cheeks, forehead, bridge of the nose, upper lip, and chin
- Can also appear on the forearms, neck, and other sun-exposed areas (less common)
- Usually symmetric, appearing on both sides of the face in similar distribution
- Chronic condition that waxes and wanes with sun exposure and hormonal changes
Science
The biology of melasma - why skin goes dark
Melanin production is a carefully regulated process. When UV radiation hits the skin, it triggers a cascade of signals that cause melanocytes to ramp up melanin production - this is the normal tanning response. In melasma, this system goes haywire. The melanocytes become hyperactive, producing melanin even in response to low levels of UV exposure, and also to heat, visible light, and hormonal signals. The melanin is then transferred to keratinocytes (the main cells in the outer skin layer), where it accumulates and darkens the skin.
- Melanocyte
- A pigment-producing cell in the skin that produces melanin.
- Melanin
- The pigment responsible for skin, hair, and eye color, produced by melanocytes.
- Epidermal vs Dermal
- Melanin can be deposited in the epidermis (surface layer), the dermis (deeper layer), or both. Epidermal melasma tends to be lighter and responds better to treatment.
- Melanocyte Stimulating Hormone
- A hormone that stimulates melanin production, elevated during pregnancy and with certain medications.
History
A brief history of melasma
Melasma has been recognized as a skin condition for centuries, though it wasn't always well understood. The association with pregnancy has been noted since ancient times, and the condition was historically called "chloasma" or "the mask of pregnancy." In the 20th century, dermatologists began distinguishing it from other hyperpigmentation disorders and gave it the name "melasma," which comes from the Greek "melas" (black) and the suffix "-asma" (condition). The development of Wood's lamp examination in the 1930s helped dermatologists visualize the depth of pigment, and the introduction of hydroquinone in the 1960s marked the beginning of effective medical treatment.
- Ancient times
- Pregnancy-related facial darkening observed but not understood
- Early 1900s
- Condition described as "chloasma" or "mask of pregnancy"
- 1930s
- Wood's lamp examination introduced to assess pigment depth
- 1960s
- Hydroquinone becomes the first standard treatment
- 1990s-present
- Advances in understanding UV and hormonal triggers; expanded treatment options
Risks
Who gets melasma - and why
While melasma can theoretically affect anyone, several factors significantly increase the likelihood of developing it.
- Being female - women account for about 90% of cases
- Pregnancy - up to 50% of pregnant women develop melasma
- Oral contraceptives and hormone therapy - synthetic hormones can trigger melasma
- Fitzpatrick skin types III-V - medium to dark skin tones are more susceptible
- Frequent sun exposure - the single most important environmental trigger
- Family history - a strong genetic component is recognized
- Certain medications - some drugs can increase sun sensitivity and trigger melasma
Questions
Frequently asked questions
Is melasma dangerous?
No. Melasma is benign - it doesn't harm your health, doesn't turn into cancer, and doesn't affect any other part of your body.
Can melasma go away on its own?
Pregnancy-related melasma may improve after delivery, but in most cases, it persists and requires treatment. It can also improve somewhat in winter with less sun exposure.
Who gets melasma?
Anyone can get melasma, but it's most common in women, particularly during reproductive years, and in people with medium to dark skin tones.
Is melasma the same as hyperpigmentation?
Melasma is one type of hyperpigmentation, but not all hyperpigmentation is melasma. Other types include post-inflammatory hyperpigmentation, sun spots, and age spots.
References
Sources
The notes below are drawn from the evidence already cited in this guide. They are not a complete bibliography.
- UV radiation is the primary environmental trigger for melasma, with research demonstrating clear links between sun exposure and disease activity.
- Hormonal influences are well-established, with estrogen and progesterone (both endogenous and exogenous) playing key roles.
- Genetic factors are significant, with a substantial proportion of patients reporting family history.
- Recent research has identified vascular changes and inflammatory components in melasma-affected skin, suggesting more complex mechanisms than simple melanocyte hyperactivity.