Hello there ,
I really feel for you because I too have tried to repair my facial skin because of cortisone damage and had a lot of problems trying things
That only my made it worse .
But At last I have found something that really does help build the skin again... From being thinned sunken and badly damaged.
I don't know in what country you live but I live in Australia And we have a TV channel called the TVSN channel. They sell this wonderful collection of serums Which do really build up your collegeni and plump the skin out.
The best one they sell is called 'collagen 8 .'It doesn't actually have collegen and in it but it repairs your Collagen very well. I wouldn't do without it. You can actually get it on eBay as well for about $110 at the best price. Tvsn are online as well ... Just search for it on google
Specialists have also told me to use high potency vitamin C Serums which really do help And also vitamin A serums . I'm sure these things will help you. ... As they have helped me . God Bless :-)