Why does melasma come back every summer?
It fades over winter. You finally feel like you’re on top of it. Then the days get longer and it’s back, right where it was. Here’s what the research shows about melasma’s summer pattern, and why it isn’t a sign you’ve done anything wrong.
The short version
- Many women find melasma settles in the cooler months and darkens again in spring and summer. Sun exposure is the main reason it returns.
- Ultraviolet (UV) radiation and visible light both drive it. Visible light can cause darker, longer-lasting pigment in olive and darker skin.
- Melasma involves lasting changes deeper in the skin, so it tends to return when sun exposure rises. That’s why protection matters most before the flare starts.
If your melasma seems to follow the calendar, you’re not imagining it. For many women it lightens through autumn and winter, then returns in spring, often in exactly the same places. It can feel like a year of effort undone in a few weeks. It isn’t. It’s how melasma behaves, and understanding why is the first step to getting ahead of it.
The summer pattern is real
Melasma’s tendency to return with the sun is so well recognised that researchers run trials specifically through spring and summer, the season when relapses happen, to test what helps prevent them.1,2
In Australia that pressure is strong and long. Sun protection is recommended whenever the UV index reaches 3, and in New South Wales UV is high enough to damage skin for more than 10 months of the year.3 Further north it’s higher again. Summer simply turns the volume up.
Why summer wakes melasma up
Melasma happens when pigment cells in the skin (melanocytes) become overactive in certain areas, usually the cheeks, forehead, upper lip and jaw. Several things push those cells to make more pigment, and summer brings more of nearly all of them at once.
Ultraviolet radiation is the best-known trigger. More hours of daylight and higher UV mean more stimulation, even on days you don’t spend outdoors. UVA passes through cloud and window glass.
Visible light is the part many people don’t know about. In a study of volunteers with olive to dark skin, visible light produced pigmentation that was darker and lasted longer than pigmentation from long-wave UVA. The same light didn’t pigment fair skin.4 That helps explain why melasma is more common, and often more stubborn, in skin that tans easily.
RelatedMelasma: the full guide to causes, evidence and care
Why it never fully switches off
For years melasma was described mainly as a hormone-driven problem in women with a genetic tendency. Hormones and genes do play a part. In a survey of 324 women with melasma across nine countries, 48% had a family history of it, and the authors concluded that a combination of factors usually triggers it.5
More recent research has added another layer. Skin affected by melasma shows signs of long-term sun damage beneath the surface: changes in the supporting fibres, a weakened membrane between the skin’s layers, more small blood vessels and more inflammatory cells.6,7 Leading researchers now describe melasma as a photoageing disorder in people who are genetically predisposed.6
That matters for the summer pattern. The visible patches can fade while those deeper changes remain, keeping the pigment cells primed. When sun exposure rises again, they respond. This is why melasma is considered a long-term, relapsing condition rather than something that’s cured once and gone.
The light most sunscreens miss
Standard sunscreens are designed to filter UV. Most offer little protection against visible light. Tinted sunscreens are different: the pigments that give them colour, mainly iron oxides, also block visible light.
This has been tested in women with melasma during the season when relapses happen. In a randomised trial run through spring and summer, researchers compared two sunscreens with the same UV protection, one tinted to block visible light and one not, to see which better prevented melasma returning.1 The tinted, visible-light-protective sunscreen performed better.
A 2025 summer study in southern France found a similar direction. Both groups’ melasma scores improved, with no difference between them, but colour measurements showed the patches blended in better with the surrounding skin only in the tinted group.2 The evidence base is still small, but it consistently points the same way.
Melasma back again this year? A Qr8 doctor can look at your pattern and history with you by private video. Book a doctor consultation →
What can help this summer
- Start before the flare. Melasma is easier to keep quiet than to calm once it has darkened. Spring is the time to be most consistent, not midsummer.
- Make sunscreen a daily habit. Apply a broad-spectrum SPF 50+ every morning, whatever the forecast, and reapply when you’re outdoors. A tinted formula adds protection against visible light.
- Use all five sun protection steps. Sunscreen works best alongside a broad-brimmed hat, shade, sunglasses and covering clothing when the UV index is 3 or above.3
- Go gently. Irritated skin is more prone to pigment, so harsh scrubs and stacking strong products can make melasma harder to settle.
- Don’t judge by winter. A clear-looking face in July doesn’t mean melasma has gone. Keeping your routine going through the cooler months makes summer easier.
If melasma has returned every summer for years, that isn’t a failure of willpower or a sign that nothing works. It reflects a condition that needs a long-term plan rather than a one-off fix.
Doctor consultations
Tired of starting again every summer?
Melasma is a long-term condition, and many women come to us after treatments that didn’t last. A Qr8 doctor can look at your skin, your history and what you’ve already tried with you by private video, from home, and talk you through a plan built for the long run.
Between appointments, your own dermatology nurse is a message away, through summer and beyond.
No referral needed. Australia-wide.
Book a doctor consultationReferences
- Boukari F, et al. Prevention of melasma relapses with sunscreen combining protection against UV and short wavelengths of visible light: a prospective randomized comparative trial. J Am Acad Dermatol. 2015;72(1):189-190.e1. https://doi.org/10.1016/j.jaad.2014.08.023
- Polena H, Queille-Roussel C, Graizeau C, et al. Comparison of visible light-protective tinted sunscreen to untinted sunscreen to protect melasma patients during summer: a prospective randomized investigator-blinded study. J Cosmet Dermatol. 2025;24(10). https://doi.org/10.1111/jocd.70450
- Cancer Council NSW. Why you need sun protection all year round. https://www.cancercouncil.com.au/news/why-you-need-sun-protection-all-year-round/
- Mahmoud BH, Ruvolo E, Hexsel CL, et al. Impact of long-wavelength UVA and visible light on melanocompetent skin. J Invest Dermatol. 2010;130(8):2092-2097. https://doi.org/10.1038/jid.2010.95
- Ortonne JP, Arellano I, Berneburg M, et al. A global survey of the role of ultraviolet radiation and hormonal influences in the development of melasma. J Eur Acad Dermatol Venereol. 2009;23(11):1254-1262. https://doi.org/10.1111/j.1468-3083.2009.03295.x
- Passeron T, Picardo M. Melasma, a photoaging disorder. Pigment Cell Melanoma Res. 2018;31(4):461-465. https://doi.org/10.1111/pcmr.12684
- Kwon SH, Na JI, Choi JY, et al. Melasma: updates and perspectives. Exp Dermatol. 2019;28(6):704-708. https://doi.org/10.1111/exd.13844
This article is general information only. It isn’t a substitute for personal medical advice, so speak with a health professional about your own skin.
