Treating a pigmented lesion with the pulsed light results in heating the melanin. The damaged lesion is then naturally sloughed as the skin exfoliates. Similar results are seen in the treatment of vascular lesions. The absorption of the light in oxyhemoglobin, de-oxyhemoglobin, and the resultant thermal action inside the blood vessels result in intraluminal coagulation, vasoconstriction, and damage to the vessel endothelial lining, all of which contribute to the degeneration and disappearance of any visible vessels.