What Kind of Health Conditions Could Cause Rapid Volume Loss in the Face?

I would suggest a visit to your internist or maybe an endocrinologist to examine your hormone levels. HIV itself doesn't necessarily cause volume loss but the treatments (protease inhibitors specifically) do. I have had patients older in life with autoimmune diseases such as sarcoid present with volume loss in the face and temples. If you are a marathon runner or triathelete this may also influence the amount of fat in your face. Good luck to you!

Rapid volume loss could be caused by a number of factors. Instead of considering fat grafting now to treat a symptom of concern, you should try to address the underlying issue by working with your primary care physician and any other physicians you may be referred to.

There are many reasons that you could lose facial volume.  Start with a physical and lab work with your primary care physician to determine the cause.  Cosmetic surgery may be needed to repair any damage.