I Used Propysalic Nf6 Ointment With Futop B On Face

I used propysalic nf6 ointment with futop b on face for 2 black patches on my face for 4-5 months . When i stopped using it my face became tooo black and dry . When i visited another doctor he told me to use kojivit + at night and photoban 30 at morning .within how many days can i return to my original skin tone