Burn scar by excess use of hydroquinone cream in my face. How can I treat this? (Photo)

Hi, Sorry you have developed this. Creams with hydroquinone are very effective in treating marks. But it doesnt treat scars. There is a proper regimen to use hydroquinone to avoid side effects like permanent hyperpigmentation called as ochronosis. Kindly visit your nearby dermatologist or a cosmetic surgeon to guide you. Good luck. 

Please go see a board-certified dermatologist to help you devise a plan for treating your scar.  
As a general rule, hydroquinone is used to treat hyperpigmentation (darkening of the skin) and not scars per se.  As noted by another doctor, prolonged use of hydroquinone can actually LEAD to hyperpigmentation (called ochronosis) instead of helping it, so hydroquinone should only be used under the care of a qualified physician and only for limited periods of time.  A board-certified dermatologist can you help you in managing all of your skin conditions and help limit and treat any scarring.  
Best of luck!