One year passed. Is it possible to have muscle repair to get rid of dent on my breast? And remove keloids? (Photo)

You should highly consider seeing a fat transfer specialist. Comfortably under local anesthesia, fat is sculpted from an area (tummy, flanks, love handles, thighs, arms, knees) and then placed into the breast depressions. You would require at least a a few sessions of fat transfers to achieve a significant change. Check out the video for a demonstration of this. 

Thank you for your photo and questions.More information and a formal consultation would be required to give you a definitive answer to your question. The procedures that led to this problem will be important to understand before determining the solution.As a general approach, scar tissue must be released and volume must be replaced. The volume could be in the form of a breast implant or fat grafting.Seek out a board certified plastic surgeon with experience in revision breast surgery. Bring your previous operative reports and as much detailed information as you can to help your surgeon formulate a plan which will meet your goals.Good luck and I hope this was helpful.

Based on your photos, I assume you had implants that have been removed. Likely the capsule was thickened and was removed as well . Were the implants subglandular? The resultant deformity can be improved with scar release and fat grafting though it may require more than one surgery. A secondary lift may also be required depending how you responded to the fat. Best wishes. 

Did you have your implants removed? You can correct all of your breast deformities using fat grafting. I recommend that you use VASER to optimize fat graft harvest and transfer success in order to maximize your results.