I have an indention on my buttocks from a cortisone shot as a child - what procedure is best for removal? (photos)

I would suggest Needle Subcision to release the scar tissue. Once the scar is lifted, you have several options for improving the texture of the skin, including Sculptra, Microneedling, or PDO smooth threads. If you have any hyperpigmentation issues or develop keloid scarring, that is important to tell the Doctor that treats you.
Dr. Scaljon

It will be challenging to remove such lesion completely, nevertheless a revised surgery fowled by Sculptra treatment could alter the scar significantly, but will never be gone fully.You need to have a consultation with a plastic surgeon to discuss all options

I would be careful using the term "removed" as this type of lesion cannot truly be removed. It could be revised, treated, altered, etc. but will never be gone, just maybe improved. Go see a plastic surgeon to discuss your options.

Best of luck!

Dallas Buchanan, MD
VIVIFY plastic surgery
Tampa, FL

Dear ashley.mcduffie88,
it is hard to tell for sure without an examination. Based on your photos, it looks like you would benefit from fat transfer. If you are considering a surgery, I would suggest you to consult a board-certified plastic surgeon. Only after a thorough examination you will get more information and recommendations.
Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery

I would first start with needle subcision to release the underlying scar tissue that is tethering that skin or tissue down. Needle subcision is using a needle under the skin to cut the scar tissue. That area would be treated with lidocaine first to numb it. After that, Sculptra could be used to help smooth out the skin.

There are 2 issues p[resented here. 1. The spread scra in skin; 2. The indented tissue defect. To try to repair just the scarring would be a local anesthesia and excisional scar revision with layered closure, fee $2,000. To correct the depressed area either fat grafting or Sculptra incision or the combination of both. Fee ranges in the $8,000=/-.