Melasma PRP: A Pigment Reading and the Main Clinical Score

If a clinic offers a more elaborate platelet-rich plasma preparation for melasma, ask which measured benefit justifies it. A 2026 split-face study found different answers on its main clinical score and a localized pigment measurement.

What was compared on each facial side?

Twenty-six women in Bangkok received three monthly sessions, with photothermal-activated PRP on one facial side and conventional PRP on the other. The activated preparation used red light and cooling. There was no untreated or sham side. [1]

At week 12, the primary modified Melasma Area and Severity Index scores were 6.50 versus 6.79, without a significant difference (P=.313). A localized melanin index favored the activated preparation by 13.09 units (P=.024). That measurement does not establish overall clinical superiority. [1]

Although the title describes a randomized trial, the methods assigned sides by odd or even enrollment number. Follow-up was short; growth-factor release was not measured. Mild injection-site bruising was the only recorded adverse event, which does not establish safety for every patient. Chulabhorn International College of Medicine funded the work; authors declared no conflicts. [1]

Confirm what is being treated

AAD explains that a dermatologist can distinguish melasma from other conditions and may use a Wood's lamp or dermatoscope to assess pigment depth. Sometimes a biopsy is needed to clarify the diagnosis. A treatment plan considers skin tone, pigment depth and possible triggers. [2]

Bring a history of the discoloration, medicines, skin products and earlier treatments. Include your GLP-1 medicine in that list. Ask which assessment supports the diagnosis and what change you want to prioritize.

A melasma score is not a measure of facial volume. Do not treat this pigment study as evidence that a procedure restores fullness after weight loss or addresses every appearance change noticed during GLP-1 treatment.

Ask what the added preparation changes

Request the exact procedure name and a written explanation of the service being offered. Ask the clinician to connect its claim to the outcome measured in the cited paper. If the explanation refers to a biological mechanism, ask whether that mechanism was measured in people receiving the proposed treatment.

Keep the discussion specific: what improvement should you expect, how will it be assessed and when will the result be reviewed? Ask what would count as insufficient benefit and what the next step would be. These are consultation questions supplied by this site, not a treatment protocol.

Obtain the total charge, the number of proposed visits and any separate review or maintenance fees. If another procedure or product is included, ask which part of the plan each study supports. Take the written proposal home if you need time to consider it.

Fit the procedure into a broader melasma plan

AAD describes treatment as often combining sun protection and topical medicines, sometimes with a procedure. Its guidance includes shade, a wide-brimmed hat and broad-spectrum sunscreen, and notes that tinted sunscreen may help when a white cast makes sunscreen difficult to use. It lists PRP among procedures a dermatologist may consider. [2]

Ask how any proposed procedure fits with your current products and prescriptions, including what to use or avoid around appointments. Request individual aftercare rather than copying a research participant's instructions. Tell the team about previous reactions and ask how to contact them if a problem develops.

For related decisions, see the melasma and tinted-sunscreen guide and oral tranexamic-acid prescription review.

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This article provides general education, not a diagnosis or an individual treatment plan. Medication information refers to US sources. Discuss medication, nutrition and cosmetic treatment decisions with qualified clinicians.