Vertical Scar on Forehead, What Should I Do? (photo)

Thank you for enclosing a photo. This area of the body can be difficult with scars as the forehead is on a significant amount of tension. One criteria that plastic surgeons always ask is how long the scar has been there. Scars typically look the worst at 4 months and better at 10 months. Usually we do not like to perform scar revisions on those scars less than a year of age. A good exam is necessary to determine how tight your skin is, and also what is going on with any skin depression you may have. With a revision, the old scar is typically cut out and then the edges are placed back together without undo tension. You will trade a scar for a scar, and hopefully your new scar will look better than your old scar. There are a few modalities for depressions as well. Best to see a board certified plastic surgeon.

Two viable options for your forehead scar include fractional co2 laser and/or surgical scar revision with excision of the scar and layered closure. 

Thank you for posting this question and providing photos. It's not completely clear from the pictures, but it seems like this may be a depressed or atrophic scar -- meaning the scarred area is lower/deeper than the surrounding tissue. If that is the case, the best treatment is to meticulously remove the scar and repair the area in layers with intentional eversion. This can be followed by laser treatments if the pink/red color comes back, or local steroid injections (kenalog) if the area becomes raised. Try to find a surgeon with a sincere interest in facial scar revision to get the best outcome possible.