Pigmentation after a summer of sun: why it comes back

Melanin is produced by cells called melanocytes and handed to the surrounding skin cells, where it sits above the nucleus like a parasol, absorbing ultraviolet light before it can damage genetic material. It is one of the body's most effective defences, and richly pigmented skin is better protected than pale skin.

The trade-off is that the same system produces visible unevenness when it is over-stimulated or when it responds in patches. That is all hyperpigmentation is: a protective response that has become uneven or excessive.

Melasma appears as symmetrical patches, most often across the cheeks, forehead and upper lip. It is driven by a combination of light exposure and hormonal influence, which is why it commonly appears in pregnancy or with hormonal medication, and why it affects women far more often. It is the most stubborn of the three.

Post-inflammatory hyperpigmentation is the mark left behind after the skin has been injured or inflamed: acne, an insect bite, a scratch, a burn, or an over-aggressive treatment. It is more frequent and more persistent in darker skin, and it fades on its own timeline, which is measured in months rather than weeks.

Sun-induced spots are the cumulative record of exposure over years, discrete and usually on the face, hands and shoulders. They are the most straightforward of the three to address and the most clearly preventable.

The ultraviolet index here is high for most of the year, not only in summer, and exposure accumulates through routine activity rather than deliberate sunbathing. A walk across a car park, a school run, a seat by a window: these are the doses that matter, because they are daily.

Two factors are less well known and matter a great deal for melasma. Visible light, the ordinary light you can see, contributes to pigmentation in darker skin types, and standard sunscreens are designed against ultraviolet rather than against it. And heat itself can act as a trigger independently of light, which makes this climate difficult in a way that shade alone does not solve.

Because the treatment addresses the pigment that has already been produced, while the tendency to produce it remains. The hormonal influence does not go away, the light and heat exposure continues, and the melanocytes involved stay reactive.

This is why the honest framing is control rather than cure, and why maintenance is part of the plan rather than a sign that something failed. Anyone promising to clear melasma permanently is describing something the condition does not do.

Daily photoprotection is the foundation, and without it nothing else holds. For pigmentation in darker skin that generally means broad-spectrum protection that also covers visible light, which is what tinted formulations containing iron oxides are for, applied every day rather than on beach days.

Beyond that, topical regimens prescribed and supervised by a doctor form the mainstay, and in-clinic treatments can help when they are chosen carefully and introduced gently. The order matters: protection first, topical treatment established, procedures considered afterwards.

For post-inflammatory pigmentation, the most useful intervention is often treating whatever caused the inflammation and then protecting the area while it resolves. Time does a great deal of the work if the skin is left alone to do it.

This is the point that matters most for the skin types common in this region. Inflammation is itself a trigger for pigment production. A treatment strong enough to inflame the skin can therefore leave more pigmentation than it removed, and that is a genuinely common outcome when devices and peels are used too aggressively on richly pigmented skin.

Heat-based treatments carry the same caution for melasma specifically, given that heat is a trigger in its own right. A cautious, layered approach is not timidity. On this particular condition it is the approach with the better record.