Pigmentation occurs when melanocytes, the cells responsible for producing skin colour, become overactive and deposit excess melanin in a concentrated area. This can happen in the epidermis, the surface layers of the skin, or in the deeper dermis. Where the pigment sits determines how accessible it is to treatment.

Epidermal pigmentation tends to be more responsive. Dermal pigmentation, which has settled into deeper structural layers of the skin, is significantly more resistant and requires more targeted, often longer-term intervention.

Post-inflammatory hyperpigmentation, or PIH, is the dark mark left after inflammation resolves. Every time acne, a cut, or an irritation heals, the skin can deposit excess melanin as part of the repair process. In medium to deeper skin tones, this response is more pronounced and the marks more persistent.

Melasma is a different condition entirely. It is driven by a combination of hormonal influence and UV exposure acting simultaneously on overactive melanocytes. It tends to be bilateral and symmetrical, appearing on the cheeks, forehead, or upper lip. Melasma is one of the most difficult pigmentation conditions to treat because it is not a fixed deposit of pigment but an ongoing process.

Sun spots, also called solar lentigines, are the result of cumulative UV damage over time and represent areas where melanocytes have permanently increased their output.

Sunscreen is essential for preventing pigmentation from worsening. It blocks the UV component that activates melanocytes and is a non-negotiable part of any pigmentation management plan. But sunscreen does not reverse existing pigmentation. It cannot break down melanin that has already been deposited, and it does not address the hormonal component of conditions like melasma.

This is why people who apply sunscreen religiously still see their dark patches persisting. The protection is real, but treatment requires something that actively interrupts the melanin production pathway or removes the pigment that is already there.

Effective pigmentation treatment depends on correctly identifying the type and depth of pigmentation before beginning. Treatments such as Cosmelan, chemical peels, fractional resurfacing, and brightening protocols work at different depths and through different mechanisms. Combining sun protection with an active treatment that targets melanin production, paired with the right in-clinic protocol, is what produces lasting change.

A thorough skin assessment that distinguishes between epidermal and dermal pigmentation, identifies the triggering factors, and accounts for your skin tone is the only way to build a plan that actually delivers results rather than temporary lightening followed by recurrence.