Pico laser effects and precautions: do melasma and dark spots need the same approach?

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‘Pico laser’ commonly describes devices using picosecond pulses, shorter than nanoseconds. Wavelengths, modes, energy output, spot sizes and indications vary by device. Although energy is delivered to pigment particles, skin responses and pigment depth affect the risks of inflammation and recurrence.

These lasers may improve superficial pigmentation, certain tattoo pigments or uneven skin tone. Melasma has a chronic tendency involving ultraviolet and visible light, hormones, heat and irritation, so one session cannot be presented as a complete solution. Excessive energy or repeated treatment may cause post-inflammatory hyperpigmentation or hypopigmentation.

Candidates for consultation should have the type and depth of the lesion assessed and be able to maintain sun protection and recurrence management. Recent tanning, a damaged skin barrier, active dermatitis, infection or wounds may require postponement.

After diagnosis and photographic documentation, wavelength, mode, energy and intervals are selected. Stinging and warmth may occur during treatment; afterward, redness, dryness, tiny crusts or temporary darkening may appear. Avoid forcibly removing flakes or crusts during recovery, and maintain moisturization and broad-spectrum sun protection.

Redness, dryness and stinging may be common. Depending on skin tone and settings, blistering, burns, post-inflammatory hyperpigmentation or hypopigmentation can occur. Disclose photosensitizing medications, recent strong peels or lasers, keloid tendency and a history of herpes simplex. Worsening pain or persistent blisters, oozing or color changes need medical attention.

Laser toning often uses repeated low-intensity treatment selected for pigment and skin tone, while IPL uses a range of light wavelengths to address vascular and superficial pigment concerns. Pico lasers are also not suitable for every pigment problem in the same way; ask about the diagnosis and rationale for settings rather than relying on the device name.

Q. Are pico lasers always good for melasma? A. Melasma may recur or worsen, so diagnosis and sun protection come first; lasers are used cautiously in selected cases. Q. How many sessions are needed? A. This depends on pigment type and response; a universal number cannot be promised. Q. Does darker pigmentation mean treatment failed? A. It may be temporary, but it needs assessment, so contact the treating clinic.

Sources include the American Academy of Dermatology's melasma guidance, DermNet's melasma information and the American Society for Dermatologic Surgery's laser treatment information. Results depend on diagnosis, skin tone, wavelength, settings and aftercare. https://www.aad.org/public/diseases/a-z/melasma-treatment https://dermnetnz.org/topics/melasma https://www.asds.net/skin-experts/skin-treatments/laser-treatments

SEOLREIM CLINIC distinguishes melasma, other dark spots, freckles, post-inflammatory pigmentation and redness before selecting a laser rather than deciding from the word ‘whitening’ alone. When pico treatment is appropriate, the sequence of laser toning, skin boosters, sun protection and recurrence care is discussed. Sensitive skin is considered when avoiding excessive energy or overly frequent treatment.

Author: SEOLREIM Content Editor / Medical Review: SEOLREIM CLINIC Medical Team / Published: 2026-09-20 / Updated: 2026-09-20