A study published online October 17, 2026 in the Journal of the American Academy of Dermatology examines sequential treatment with 1550-nm fractional focal point technology and pulsed dye laser (PDL) for port-wine birthmarks — and the design itself signals where laser protocols for vascular malformations are heading.

The paper, titled "Sequential 1550-nm fractional focal point technology and pulsed dye laser for port wine birthmarks: A referral center retrospective and survey study," comes from a research group whose names will be familiar to anyone tracking laser dermatology: David A. Hashemi, Shirin Bajaj, Jordan V. Wang, Henry H.L. Chan, R. Rox Anderson, Dieter Manstein, and Roy G. Geronemus.

That author list matters. Anderson and Manstein, based at Massachusetts General Hospital and the Wellman Center for Photomedicine, are among the original developers of fractional photothermolysis. Geronemus, at the Laser & Skin Surgery Center of New York, has decades of referral-center experience treating capillary vascular malformations. Chan, at the University of Hong Kong, brings one of the largest port-wine stain clinical databases in Asia. When this group publishes on a laser sequence, practicing dermatologists tend to read it closely.

What did the study actually do?

The title tells you the two arms of the method. First, a 1550-nm nonablative fractional device — focal point technology, the class that concentrates energy at a defined depth below the skin surface rather than at the epidermis. Second, pulsed dye laser, the 585–595-nm workhorse that has been the standard of care for port-wine birthmarks since the late 1980s.

The design is a retrospective chart review combined with a patient survey, conducted at a referral center — not a randomized controlled trial. That's a meaningful distinction when you weigh the findings. Retrospective designs capture real-world treatment patterns across heterogeneous patients, which randomized trials often exclude, but they can't control for selection bias or treatment-order effects the way an RCT can.

The journal's own publication slot — JAAD, available online October 17, 2026 — gives the work a high-visibility venue for clinical dermatology audiences.

Why pair the two wavelengths at all?

The rationale built into the sequence deserves attention. Port-wine birthmarks (nevus flammeus) are congenital capillary malformations that PDL lightens but rarely clears completely, and re-darkening over years is well documented. Resistant and recurrent lesions are exactly the patients who end up at referral centers like the ones in this study.

Fractional 1550-nm devices target water rather than hemoglobin, creating microscopic thermal zones in the dermis. Using that nonvascular mechanism before or after PDL is a layering strategy — attacking the malformation through two different chromophore targets across sequential sessions rather than escalating PDL fluence alone.

What does this change for clinicians managing stubborn port-wine stains? Until full results circulate, the honest answer is: a hypothesis with strong institutional backing. The study documents how the sequence performed in real referred patients, with survey data adding the patient-reported dimension that pure chart reviews miss.

The larger context

n Port-wine birthmarks affect roughly 3 in 1,000 newborns, and their management remains one of the most persistent challenges in laser dermatology — complete clearance with PDL monotherapy is uncommon, and hypertrophic nodules in adulthood can complicate matters further. Any refinements to sequencing protocols have downstream relevance for the thousands of patients treated at vascular anomaly centers each year.

The retrospective-plus-survey format also fits a broader trend in procedural dermatology: single-center real-world evidence published from high-volume referral practices, complementing the sparse RCT literature on rare vascular lesions.

Derm Field will follow the full dataset as the article moves from online-first to print, and watch for whether the Anderson–Geronemus–Chan collaboration generates the multicenter prospective work this hypothesis now invites.