Can hydroquinone or tretinoin cause skin on cheeks to become darker and create more dark patches?

I use the Hydroquinone in the day and Tretinoin at night, is this the best method of application? The before picture was taken in a very lighted bathroom so it makes my skin look lighter, but it is only shown to show the dark patches were not as prevelant and in some areas not there. There are also sections of small bumps. What is happening to my face? Please help. Also what would be a good otc remedy for dark circles under my eyes? Thanks