If I lost my buccal fat due to anorexia and weight loss, can I gain it back by gaining weight? Is it lost forever?

if I had lost my buccal fat due to anorexia and excessve weight loss, can i gain it back by gaining weight? Or is it forever lost? I do get Sculptra but it isn't growing (only lumpy) and i am super scared of the risk of blindness! If it's a no to buccal fat, what about volume on other areas like forehead and chin? Will I gain volume there if I gain weight? Thank you.