6 weeks post op cortisone injection in the hip. Can Cortisone Injections Cause Fat Atrophy?

I received a cortisone injection in the hip (upper buttocks) for severe allergy symptoms about 6 weeks ago. I just noticed a large indentation in the area around the injection site. It looks like the fat has been "melted" away in this area. Is it anything to be concerned about? Will it eventually fill back in? Should I worry about future shots?

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