Some patients with sensitive skin worry that this will be a problem, but with the use of anaesthetic cream, almost anyone can comfortably undergo laser therapy to remove unwanted birthmarks. What happens after birthmark removal? You may notice some slight temporary bruising or whitening at the area, and this is to be expected as it indicates that the laser is having its lightening effect on the birthmark. This soon fades, and you will notice the birthmark fading along with it. Scarring is not generally a side effect of birthmark removal. To keep your skin looking its best, stay out of the sun and sun beds for a few weeks after your treatment. It is also recommended that you use sun cream of SPF 30 or more for a few months.