Thanks for your query to Health Care Magic ...
I read your concern .. There is alternate for Hydroquinone
to maintain lightened skin tone , I would recommend Kojic acid
after stopping hydroquinone application .
also Vitamin C
helps to maintain skin tone along with Kojic acid .
( Kojic acid is not a hydroquinone cream ) .
Avoid exposure to sun light or apply sunscreen 15 mins before exposure to sun to protect from UV rays and to maintain good skin tone .
Hope this information is useful for you .
Thanks & Take Care .