Regarding Hyperpigmentstion, Do You Think Using Too Much On Hydroquinoin Develop Side Effects?

I'm 35 yrs old.I was using Obagi Condition and Inhance System + tretinoin cream 0.05% for full three months (day/night ) to treat my pigmentation on face and now I'm on my first month maintenance stage. I was so happy with the result because everything is gone and my face is so smoth and even color but I notice that they are coming back more than it was before. Im using the SPF 35 board- spectrum sunscreen everyday. Do you think using too much on hydroquinoin develop side effects?

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