Hello Dooby, Corticosteroid injection, such as Kenolog, can result in atrophy of the subcutaneous fat of the injection site. The process results in fat necrosis and scarring. Keno log is a long acting steroid, so I generally recommend waiting for at least 6 months prior to performing any definitive treatment. Initially, conservative therapy, including message and ultrasound therapy, is advised to soften the scarring. I have treated several patients with similar dents. I generally do not recommend the temporary fillers due to the large volume required to correct these deformities. Fat transfer is ideal to correct this problem. Fat transfer can be performed in the office with local anesthesia to fill in the contour deformity. Most of the time only one treatment is required. If there is a large deformity, or excessive scar tissue, a second treatment may be required.
I would recommend consulting with a Board-Certified Plastic Surgeon.
Best regards, Andrew Lyos, MD, FACS