In short. Melasma is a chronic pigmentation condition in which normal pigment cells keep producing brown pigment under a stronger signal than they should, usually daylight and often hormones. The patches are roughly symmetrical, sit across the cheeks, upper lip, forehead or jawline, and relapse after treatment rather than clearing for good. Treatment lightens them; nothing removes the tendency.
Key points
- The pigment cells are normal; the signal driving them is not.
- Melasma is usually symmetrical, which separates it from most other pigmentation.
- Light, visible light, heat and hormonal change are the usual drivers, often overlapping.
- It is chronic and relapsing: treatment lightens it, maintenance keeps it lighter.
- It cannot be scrubbed, peeled or lasered away permanently.
You look in the mirror and they are there again: soft brown patches, roughly the same on both sides of the face, across the cheeks, the upper lip, the forehead or along the jaw. They do not itch, hurt or flake. They sit there quietly, and they usually appeared without a single obvious cause.
Not damage, and not an infection
Melasma is not an allergy, not an infection and not the result of something you did wrong. The pigment cells in your skin produce melanin to protect you from light; in melasma they over-react and keep producing it, depositing brown pigment in the upper layers of the skin. The cells themselves are normal. The signal they are following is not, and that signal is usually light, often hormones, and sometimes both.
Why did the patches appear when it did?
The timing is the most useful clue you have. Most people can point to a pregnancy, a change in hormonal contraception or hormone replacement, a summer, a long drive in bright daylight, or a new medicine. Often two or three of those overlap, which is why the patches arrive during one particular year rather than gradually. Working beside a bright window counts too: daylight through glass still reaches the skin, and the part of sunlight that passes through glass is the part melasma responds to.
What does the pattern on the face suggest?
Melasma is usually symmetrical, which is one of the things that separates it from other pigmentation. It appears across the cheeks, across the centre of the face, or along the jawline; the jawline pattern is more often linked to hormonal factors. It also appears on the forearms, where light and heat are the main drivers. The colour ranges from a faint shadow visible only in certain light to a clearly visible brown that no longer fades in winter.
Colour is also a rough guide to depth. Brown pigment sitting in the surface layer tends to look more defined and generally responds better to treatment, while pigment held deeper appears greyer or bluer in some lights and is slower to shift. Most faces have both, and judging the depth is one reason an assessment needs an examination rather than a photograph.
Does melasma clear and finish?
Not in the way a single spot does. The pigment can be lightened, but the condition behind it stays.
The word that matters is chronic
Melasma is a long-term, relapsing condition. It is not dangerous and it does not mean something else is wrong, but it does not behave like a blemish that clears and is finished with. That one fact explains why a successful course of treatment is followed by the patches returning, and why keeping them lighter is an ongoing arrangement rather than a completed task.
What it is not
The differences that matter are mostly about pattern and symmetry.
| What you notice | What it points to | What follows |
|---|---|---|
| Soft brown patches, roughly the same on both sides | Melasma | Management, not scrubbing |
| Small, separate, scattered spots | Sun spots or freckling | A different diagnosis |
| Flat brown marks where spots used to be | Marks after acne | A different diagnosis |
| One patch alone, changing shape or colour, or with an irregular border | Not typical melasma | Examination, not a beauty counter |
| A pigmented spot that bleeds, crusts, itches or becomes raised | Not typical melasma | Examination, not a beauty counter |
| Darkening within weeks of a new medicine or hormonal change | A possible trigger to review | Medical conversation first |
It is not sun spots or freckling, which are small, separate and scattered rather than symmetrical. It is not the flat brown marks that follow acne, which sit where the spots were. It is not caused by a dirty face, a poor diet or a bad cream, and no amount of cleansing will shift it.
What can treatment change, and what can it not?
A course of treatment can make the patches lighter and reduce the contrast between the pigmented skin and the skin around it. What it cannot do is remove the tendency. Melasma is not something that can be scrubbed, peeled or lasered away permanently, whatever the advertisement says, and keeping the patches lighter is an ongoing arrangement rather than a completed task.
When should a doctor see this rather than a beauty counter?
See a doctor rather than a beauty counter if
- A patch is new, one-sided, changing shape or colour, or has an irregular border.
- A pigmented spot bleeds, crusts, itches, or becomes raised or nodular.
- The darkening is rapid, or began after a new medicine or hormonal change.
Sources
Internal links
Frequently asked questions
Did I cause this by using the wrong product or not cleansing enough?
No. Melasma comes from pigment cells responding to light and hormonal signals, not from poor cleansing or a bad product. Scrubbing harder does not shift it, and a damaged barrier from over-cleansing makes it harder to treat. The useful question is not what you did wrong but what is driving the patches now.
Is melasma a sign that something is wrong inside my body?
Usually not. The great majority of melasma is a skin condition on its own. There are two exceptions worth checking: thyroid problems appear more often in people with melasma, and some medicines make the skin more light-sensitive. If pigmentation comes with fatigue, weight change or a new medicine, that deserves a medical look.
Does the colour of the patch tell you how deep the pigment is?
Partly. Brown pigment sitting in the surface layer tends to look more defined and generally responds better to treatment, while pigment held deeper appears greyer or bluer in some lights and is slower to shift. Most faces have both, and judging the depth is one reason an assessment needs an examination rather than a photograph.
Risks & Limitations
- Melasma is chronic and relapsing. Treatment lightens it and maintenance keeps it lighter; it does not cure it.
- Sunlight and visible light can bring the patches back after a good result, so photoprotection is permanent.
- Aggressive laser treatment can worsen melasma and cause rebound darkening in some patients.
- Pregnancy, breastfeeding and hormonal treatment change what is safe, and must be discussed before any plan starts.
When to Seek Care
- A pigmented patch that is new, changing, asymmetrical or bleeding needs assessment to exclude other diagnoses.
- Darkening is rapid, or follows a new medicine or hormonal treatment.
- Skin becomes inflamed, blistered or persistently red after a lightening product or procedure.
- Pigmentation appears with fatigue, weight change or other general symptoms.
References & Further Reading
- American Academy of Dermatology (AAD) — patient guidance on this condition
- International League of Dermatological Societies (ILDS) — global standards of care
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews on the treatments discussed here
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.