How long after surgery and injection are you?
Steroid injections dissolve lumps but also dissolve normal fat beneath the skin. Steroid injections also cause the skin to form new blood vessels that cause the purple discoloration, which will get better but may leave small vessels behind that show on the skin.
IPL or Intense Pulsed Light treatments are safe and can close down the new blood vessels and lessen the red appearance.
The depression is caused by atrophy or loss of fat. In time, after your skin has stabilized and healed, the depression can be plumped with a very carefully done injection of fat taken from another body area. Another possible method is to build new collagen in the tissue using the 1540 fractional non ablative laser.
View a photo of plumping of a scar caused by a steroid injection in the chin skin - the result is quite dramatic.
These are sophisticated new techniques that require the right equipment and most importantly experience and proper machine settings.
Discuss this with your doctor. If he/she agrees, I am happy to review your photos and speak with the doctor. I am sure he/she wants to help you.
Fortunately there is a way to improve things.