Skin Discoloration After Fat Transfer

You may want to have your doctor re-examine you to see if he or she can find a solution.
It is possible there had been fat necrosis to the grafts, causing a bluish discoloration. Usually the grafts would be very firm and unnatural feeling.
Or there might be chronic bruising in the dermis itself, more difficult to treat.

It is difficult to determine what this could be from the description.
It is probably consistent with fat necrosis and or resorbing hematoma but these usually tend to be firm.
Fat necrosis will likely require some sort of an intervention such as aspiration, liposuction or excision.
Resorbing hematomas tend to resolve on their own.

The skin color pigmentation changes that you describe can come from the trauma of the fat injections. This may be permanent. Sometimes bleaching creams or lasers can help with pigmentary problems.

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.