Vascular LASER - Pulsed Dye Laser (PDL), KTP, Long pulsed YAG
Vascular LASERs target red-coloured haemoglobin in blood running through the vessels just below the surface of the skin. The high energy produced by the LASER heats up the blood vessel which then results in either vessel rupture or clotting withn the vessel such that the visibility of the vessel is reduced.
Treatment with a vascular LASER will often result in swelling and redness of the skin for 3-5 days afterwards. For Pulsed Dye LASER treatment specifically, you would expect to have dark purple bruising (purpura) in the treated area which lasts for 10-14 days.