Deep set eyes. Can I treat them with HA filler?

in office peels, lasers, and fillers will help.

at home peels like cosmelan, enlighten and aerify along with dermarolling (emerageskin roller with anteage MD ampules) should be started now. 

There are many things you can do to treat under eye hollows and dark circles. A surgical option to remove skin and/or fat will such as lower eyelid blepharoplasty with or without fat pad repositioning will be the best long term. There are many things you can do to treat under eye hollows and dark circles without surgery. Non invasive less downtime options such as fillers, lasers, microneedling/PRP, cosmelan peels, and microneedling RF like Fractora or morpheus can all help give some improvement. Accutite can often be used or stronger lasers like erbium or co2 spot treatment can tighten the skin and give very quick improvement in wrinkles and texture. I suggest you get a formal consultation to see what is best for you and your goals. Best, Dr. Emer.

Thank you for submitting your photos. Based upon these pictures, I think you would be a good candidate to get dermal fillers to help fill out the hollowness so the under eyes look smoother, less dark, and less tired. This has to be done by an experienced and skilled injector with care so it will look natural and not lumpy. Good luck!