Is Melalite Advisable For Melasma On Cheeks And Forehead?

hello dr., i have melasma on cheeks n forehead since last 3 years. then, i used melalite xl for about 3 monts.it was quite effective but after that i discontinued it.then, it reappeared.later, i became pregnant .so, i didn't use any creams.now, my baby is 8 months old and doing breast feeding.last month my doc.advised to use melalite xl for 1 month and then melaglow and retino a cream.till, i was using melalite xl, my skin was fantastic.but,when i discontinued it and start using retina a 0.025%, my cheeks became more darker.now i m not using anything except sunscreen and olay total effect.plz,advise me.