What Triggers Melasma? Sun, Heat & Hormones in Pakistan

Melasma is a common pattern of symmetrical brown patches on the cheeks, forehead and upper lip, and it is especially frequent among women with medium to deeper skin tones in Pakistan. It has no single cause. Sun, visible light, heat, hormones, some medicines and family history combine, which is why knowing your personal triggers can help you manage it. This guide explains the main triggers and what you can control.

Key takeaways

Melasma is driven by a combination of UV and visible light, heat, hormones and genetics
Daily, year-round sun protection is the foundation of any melasma plan, because patches return with sun
Pregnancy, hormonal contraceptives and some medicines can trigger it, so ask your doctor before changing them
Melasma needs a dermatologist’s diagnosis, since other conditions look similar

What is melasma?

Melasma is an acquired pigmentation condition that shows as symmetrical, brown to grey-brown patches, usually on the cheeks, forehead, upper lip and sometimes the chin. A clinical and epidemiological review describes it as common in women, in people with darker skin types and in regions with strong sun. Pigment cells in the patch are overactive, and the deeper layers of skin may also be affected, which explains why it often returns after treatment. It is harmless to health, but it can affect confidence.

A consensus statement on melasma management stresses that it is a chronic, relapsing condition for many people, so the aim is control rather than permanent cure. Understanding triggers helps reduce flare-ups.

What are the main triggers?

Sun exposure is the biggest. Ultraviolet light activates pigment cells, and visible light, which includes the blue-violet end of the spectrum from sunlight and, to a lesser extent, screens, can also worsen pigment in people with darker skin. Heat is another factor, and many patients notice flare-ups in hot weather, in kitchens, near ovens or after hot saunas, though the evidence is still developing. Hormones play a role, which is why melasma is more common in women, during pregnancy, with some hormonal contraceptives, and in some thyroid conditions.

Family history matters too: if close relatives have melasma, your chance is higher. Some medicines and cosmetics can trigger it, and so can skin irritation from harsh products, scrubs or aggressive procedures.

Trigger	How it contributes	What you can do
UV light	Activates pigment cells	Daily sunscreen SPF 30 or higher, hat, shade
Visible light	Can darken pigment in medium to deep skin	Tinted or iron oxide sunscreen, shade
Heat	May worsen flare-ups in some people	Cool environments, avoid prolonged heat on the face
Hormones	Pregnancy, some contraceptives and thyroid conditions	Discuss with your doctor
Genetics	Family history raises risk	Early protection
Irritation or harsh procedures	Inflammation can darken patches	Gentle routine, avoid aggressive treatments
Some medicines and fragranced products	Photosensitivity	Ask a pharmacist or doctor

What are the practical steps?

Protect your skin every single day. Apply a broad-spectrum sunscreen of SPF 30 or higher generously each morning and reapply every two hours when outdoors. Consider a tinted sunscreen containing iron oxides, which block visible light, as a layer of protection. Wear a wide-brimmed hat and sunglasses and avoid peak midday sun. Keep your routine gentle: avoid scrubs, harsh peels and unsupervised procedures, which can inflame skin and darken patches. Our guide on tinted sunscreen and visible light explains how iron oxides work.

Apply sunscreen every morning, even indoors near windows
Reapply every two hours when outdoors
Wear a hat and sunglasses and avoid midday sun
Keep skin products gentle and avoid scrubs
Ask your doctor before starting or stopping hormonal medicines

Where do skincare ingredients fit in?

Ingredients such as tranexamic acid, niacinamide, vitamin C, azelaic acid and alpha arbutin are used to even tone in melasma-type patches, often combined with doctor-prescribed options. A systematic review of topical and systemic therapies in melasma found that many options are used with varying levels of evidence, and relapse is common. Over-the-counter products can support a routine, but treatment of established melasma is best guided by a dermatologist.

The Brightening & Anti-Aging Serum is a brightening serum for uneven tone and dark spots, used in the evening alongside daily sunscreen. It is a skincare product, not a treatment for melasma, so see a doctor if you have melasma-type patches. See melasma treatment in Pakistan and tranexamic acid for uneven skin tone.

Approach	Role	Notes
Daily sunscreen	Foundation	Never skip
Tinted or iron oxide sunscreen	Extra visible light protection	Useful in medium to deep skin
Brightening actives	Support tone	Gradual, relapse common
Prescription treatments	For established melasma	Dermatologist-led
Procedures	Selected cases	Risk of worsening; specialist only
Gentle routine	Prevents irritation	Avoid scrubs and strong acids

What about pregnancy, contraceptives and thyroid problems?

Pregnancy is a well-known trigger, and melasma that appears during pregnancy may fade after delivery, though not always. Hormonal contraceptives and some other hormone treatments can trigger or worsen melasma in susceptible people. Do not stop or change any prescribed medicine on your own. Instead, talk to your doctor about your options. Thyroid disease is also associated with melasma, so ask about a check if you have other symptoms such as tiredness, weight change or irregular periods. If you are pregnant or breastfeeding, ask your doctor before using any active ingredient. Our guide on pregnancy-safe skincare lists what to ask.

When should you see a doctor?

See a dermatologist if you have symmetrical brown or grey patches on the face, if patches are spreading, if you are pregnant or planning pregnancy, or if home care has not helped after three months. A doctor can confirm the diagnosis, check for other conditions, and offer prescription options safely for your skin type. Avoid unregulated bleaching creams, which can make melasma worse.

How can you track your own triggers?

A simple diary helps. Each week, note your sun exposure, time spent in heat, products used, medicines, your cycle or pregnancy status, and take a photo of your patches in the same light. After a couple of months, you may see patterns, such as flare-ups after beach holidays, hot kitchens or a new product. Share the diary with your dermatologist, since it helps them choose a plan and judge whether treatment is working.

Remember that triggers vary. Something that affects one person may not affect another, so avoid copying strict rules from social media and focus on what you observe in your own skin.

What are the myths about melasma?

A common myth is that melasma is caused by dirt, poor hygiene or an unhealthy liver, which is not true. Another is that scrubbing and strong bleaching will remove it, when these often make it worse. A third is that sunscreen is only for beach days, when in fact daily exposure through windows and short walks adds up. And a fourth is that once treated, it is gone forever, whereas it commonly returns without continued protection. Understanding these myths helps you avoid products and habits that do more harm than good.

Frequently asked questions

What is the main trigger for melasma?

Sun exposure is the biggest. UV and visible light activate pigment cells, which is why daily sun protection is the foundation of care.

Does heat cause melasma?

Heat may worsen flare-ups in some people, and many notice more pigment in hot weather or near ovens. Evidence is still developing.

Can hormones cause melasma?

Yes. Pregnancy, some contraceptives and certain thyroid conditions are linked with melasma. Talk to your doctor before changing medicines.

Can melasma be cured?

Melasma often relapses. Treatment aims to control and lighten patches, with ongoing sun protection to keep them from returning.

Does blue light from screens cause melasma?

Visible light from the sun is the main concern. Evidence on screens is less clear, but iron oxide sunscreens block visible light.

Is melasma only in women?

It is much more common in women, but men can get it too.

Can I treat melasma at home?

Sun protection and a gentle routine are essential. Established melasma is best managed with a dermatologist.

When should I see a dermatologist?

If you have symmetrical patches, they are spreading, you are pregnant, or three months of careful care has not helped.

Sources

Handel AC et al.. Melasma: a clinical and epidemiological review. An Bras Dermatol. 2014. PubMed 25184917
Sarkar R et al.. Topical and Systemic Therapies in Melasma: A Systematic Review. Indian Dermatol Online J. 2023. PubMed 38099013
Ocampo-Candiani J et al.. Latin American consensus on the treatment of melasma. Int J Dermatol. 2025. PubMed 39415312
American Academy of Dermatology. Sunscreen: how to apply

A gentle reminder

Skincare helps the look and feel of your skin; it does not treat medical conditions. Patch test any new product behind the ear or on the inner arm first, and introduce one new active at a time. If you are pregnant or breastfeeding, or you have a skin condition such as eczema, ask your doctor before adding active ingredients. See our FAQ for more, or build your own routine.