During your treatment, the Lumecca will omit a bright flash of light that might feel like a light snap of elastic on your skin. You may experience redness and a slight warming sensation after treatment, which usually subsides within an hour. Over the next day or two, you may notice pigmented spots beginning to darken. These pigmented lesions will flake off over the course of the following week, leaving you with a more even skin tone. For vascular lesion treatments, the vein may blanch and disappear. The vein could also change color, which will dissipate after a few days.