Skin Discoloration After Fat Transfer

The colors you describe can be the result of pigment in the skin - treat with skin bleach(hydroquinone).
It can be the result of iron (hemosiderin) in your skin as a breakdown product of blood from a bruise.
It can be the result of thin skin showing the blood vessels under the skin.
Go see your doctor.

These could be iron deposits after bruising where the iron is left behind. Sometimes, mild heat and massage can help this as well as exercise or increasing the lymphatic drainage in this area.
Sometimes, it can be due to prominent vessels that are residual after the procedure and the stimulation caused by the procedure post operatively. Or it could be that your fat injections just elevated this area so that you can see it better.
What could be causing this is that your eye muscle is showing through your skin more given the thin skin in this area. The treatment is increasing the distance and adding layers between your eye muscles and the skin through fillers and more fat injections superficially between the skin and muscle. Also, CO2 resufacing can create an extra layer of collagen that can disguise the transparency of the skin that allows the deep color of the muscle to show through.