The KTP vascular laser is a specialised device for superficial blood vessels that emits green light at a wavelength of 532 nm, sometimes combined with yellow light at 577 nm. This light is selectively absorbed by haemoglobin within superficial vessels, allowing controlled heating and coagulation of the target vessel while minimising damage to the surrounding skin. Owing to this selectivity, KTP vascular laser treatment is particularly suitable for fine telangiectasias, small- and medium-calibre facial capillaries, small angiomas (such as cherry or spider angiomas), and localized couperose or facial redness, including selected cases on the décolleté.

During a KTP laser session for facial redness and broken capillaries, the light energy is converted into heat inside the vessel, leading to its gradual closure and resorption over time. Pulse duration (typically between 1 and 50 milliseconds) is carefully adjusted by the physician according to vessel type, diameter and depth, anatomical location and the patient’s skin phototype, in order to optimise both safety and clinical outcome. A cooling system or contact gel is often used during treatment to increase comfort, protect the epidermis and reduce the risk of superficial side effects.