Tear trough filler: Hemosiderin Staining Permanent? (photo)

hemosiderin happens because the iron pigment from the red blood cell infiltrates the skin . It can take several months to improve without intervention . Q-switched lasers have been successful ( which are some tattoo removal lasers) . Skin cell turnover treatments such as microdermabrasion can have some limited success 

Dear melissa,
Thank you for your question. 
The general course for a bruise is from blue black, to green, to yellow and finally back to your original skin colour. 
Bruises can occur immediately, or a few days after. Generally, bruises resolve in 7 to 14 days. 
After 2 months, what you are seeing is likely the Tyndall effect, which is a bluish discoloration that appears if hyaluronic acid fillers are injected too superficially under the skin. Another possibility is hyperpigmentation from hemosiderin deposits contributed by red blood cells.
It's best to review with your doctor, who may offer you the option of dissolving the filler.
I hope this helps.

Your photo does demonstrate some darkening under the eyes. Any bruising or staining should have resolved at this point after the injection. The darkening may represent Tyndall and if this is the case, it will likely need to be reversed using hyaluronidase. This occurs when the wrong filler is used under the eyes, too much of it is injected, or it is injected too superficially.