Sun Spots, PIH, or Melasma? Pigment Is Not One Laser Problem

“I want the brown spots lasered off” sounds wonderfully efficient. Pigment is rarely that cooperative.

Solar lentigines, post-inflammatory hyperpigmentation and melasma can all look brown on the face and require different treatment logic. A laser or IPL platform can target pigment without explaining why that pigment is there. That missing diagnosis is where expensive mistakes begin.

Sun spots: discrete targets are the easiest version of the problem

Solar lentigines, commonly called age spots or sun spots, are localized areas of increased pigment associated with cumulative ultraviolet exposure. When a qualified clinician has confirmed that a lesion is benign and appropriate for cosmetic treatment, selected pigment lasers or IPL can be effective options.

The key phrase is confirmed that the lesion is appropriate for cosmetic treatment. A new, changing, irregular or otherwise concerning pigmented lesion should not be treated as a decorative inconvenience before it has been properly evaluated.

For genuine lentigines, treatment may involve IPL, Q-switched or picosecond systems, or other wavelength-specific approaches depending on skin tone and device availability. The best choice is not automatically the newest pico platform.

Post-inflammatory hyperpigmentation: the pigment is the aftermath

PIH appears after inflammation or injury: acne, eczema, burns, picking, procedures or other skin insults. The dark mark is therefore a record of a process that has already irritated the skin.

That matters because another inflammatory procedure can improve pigment in one context and provoke more pigment in another. Skin tone, the original trigger, whether inflammation is still active, and the aggressiveness of treatment all matter.

In darker skin, PIH risk becomes particularly important because greater epidermal melanin can increase the consequences of thermal or light-based injury. A provider should be able to explain why a device is worth that trade rather than treating every brown mark as a laser target.

Melasma: why “pigment removal” language becomes dangerous

Melasma is a chronic acquired pigmentary condition influenced by factors including light exposure and hormones. It is common in medium and darker skin tones and can persist or recur for years.

Sun protection is foundational. The American Academy of Dermatology specifically notes that melasma treatment plans include sun protection, and visible light may also matter for some patients. A machine cannot replace the ongoing trigger-management part of the plan.

Laser and light treatments can be used in selected melasma cases, often as part of combination therapy, but the literature is inconsistent enough that “laser for melasma” should never sound like a straightforward pigment-erasing service.

A 2026 systematic review and meta-analysis found low-fluence Q-switched 1064-nm Nd:YAG showed statistically significant improvement in subgroup analysis, while picosecond and fractional laser subgroups did not significantly outperform controls in that analysis. Other systematic reviews have reported benefit with picosecond or combination approaches. That disagreement is not useless. It tells you the evidence depends heavily on modality, settings, combinations, study design and patient selection.

Pico is a pulse duration, not a diagnosis

Picosecond lasers deliver very short pulses and can be used for tattoo pigment and selected pigmentary concerns. “Pico facial” has also become marketing shorthand for a broad category of treatments.

The device may be technically sophisticated. The question remains ordinary: what pigment is being treated, what wavelength is being used, and what evidence supports that indication in your skin?

A picosecond laser that is excellent at one target does not become a universal complexion corrector because the pulse is measured in trillionths of a second.

IPL can be excellent for photodamage and still be wrong for your pigment

IPL and BBL can improve selected sun-related pigment and vascular changes. They also deliver broad-spectrum light that can interact with epidermal melanin.

For discrete sun damage in an appropriate skin type, that can be a useful match. For melasma or PIH-prone skin, the risk-benefit calculation can be different. Recent tanning makes it different again.

This is why the phrase “photofacial for pigmentation” needs a second sentence.

Resurfacing treats texture and pigment differently

Fractional CO₂, Er:YAG and nonablative fractional lasers may improve aspects of photodamage and dyschromia while primarily being used for resurfacing and remodeling. They should not be selected merely because the reader wants a brighter complexion.

If texture, scars and pigment are all present, combination treatment may make sense. It may also compound recovery and pigment risk. Ask which problem each component is intended to solve.

Before treatment, classify the pigment

A useful consultation should distinguish among:

• Discrete sun-related lentigines: localized pigment targets.
• PIH: pigment following inflammation or injury.
• Melasma: chronic patterned pigmentation with recurrence and trigger considerations.
• Freckles/ephelides: genetically influenced pigment that may recur with sun exposure.
• Nevi and other lesions: may require diagnostic assessment rather than cosmetic treatment.
• Mixed pigment: more than one process can coexist.

If the clinic cannot tell you what category it believes it is treating, the laser discussion is premature.

Questions that matter more than “Which laser do you use?”

• What is the diagnosis or working diagnosis for this pigment?
• Do any lesions need evaluation before cosmetic treatment?
• Is this melasma, PIH, sun-related pigment or a mixture?
• What exact device, wavelength and settings family are you considering?
• How does my skin tone and history of dark marks change the risk?
• What is the chance of rebound pigmentation or PIH?
• What sun and visible-light protection is part of the plan?
• Will topical treatment or trigger control be necessary before or after the procedure?
• What would make you choose not to use a laser or IPL?

The Verdict

Pigment is a visual description, not a diagnosis.

Sun spots can be satisfying laser targets. PIH requires respect for the inflammation that created it. Melasma is a chronic pigment disorder that can punish simplistic treatment plans. The device comes after that distinction, not before it.

The machine may remove pigment. Good judgment decides whether that pigment should be targeted in the first place.

This article is educational. New, changing or unexplained pigment should be appropriately evaluated rather than assumed to be benign cosmetic discoloration.