Abstract
Port-wine stains (PWSs) are congenital lesions characterized by ectatic vessels in the superficial dermis. The cause of these lesions is unknown, but 1 theory is that they result from a diminished neural regulation of the blood flow, secondary to a reduced number of perivascular nerves,<sup>1</sup>which, in turn, results in erythrostasis and progressive vessel ectasia. The use of pulsed dye lasers is currently the treatment of choice for PWSs. The 577-nm or 585-nm wavelength selectively targets oxyhemoglobin and the 450-microsecond pulse duration is sufficient to cause intravascular coagulation without excessive heat dissipation to the epidermis or adjacent dermal structures.
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