would recommend only non permanent fillers. i only use juvederm in this area.
the skin is paper thin and you will likely bruise.
try icing 5 minutes before injection to shrink the blood vessels. some physicians will inject an anesthetic with epinephrine before injecting this area.
these injections are the trickiest injections on the face. make sure you feel confident with your injector for this area in particular. it is a very unforgiving area