Depending on how your scar appears, there are a number of lasers that may be of use in your case. The V-beam laser can help with redness in a scar while the fraxel laser is helpful for scar remodeling. In some cases, surgically removing the scar may be a more appropriate option. It would be best to consult with a board certified Dermatologist or plastic surgeon.
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I have a scar after having my appendix removed 4 years ago. What are my options for having it removed?
Your best bet is to meet for a consultation with a board certified plastic surgeon with experience with scar management. There are a few options to improve scars and may range from laser treatments to scar revision where the unsightly scar is removed and the site is resewn by a plastic surgeon to make a better scar. Certainly if weight gain made the scar look worse, then weight loss will help improve it as well. It really needs an evaluation in person to determine the best course of treatment but there is nothing that removes scars completely. Good luck!
Unfortunately scars are permanent. If the scar is depressed or stretched out perhaps it could be revised, but it would have to be seen in person.