Fat loss from steroid injection?

Thank you for your question.  Yes, absolutely.  Steroid injections can cause fat atrophy as well as formation of small blood vessels in the skin (telangiectasias) and thinning of the skin and hypopigmentation.  This typically happens with large doses or repeat injections.  A one time injection of a reasonable dose should rarely cause issues.  

there are many alternative treatments for this, I do not do steroid injections typically for this type of issue.  find a cosmetic expert for treatment.  Best, Dr. Emer.

You can get a small dent of fat loss after an injection of kenalog. Yes, the tissue does rebuild itself - I've never seen it not do this - but it does take time. The rebuilding will depend upon your age and skin recovery ability, but it will happen. There is not a good way to give you a timeframe. "This
answer has been solicited without seeing this patient and cannot be
held as true medical advice, but only opinion. Seek in-person treatment
with a trained medical professional for appropriate care."