Hello Doctor, I Was Using Melalite Forte And Flutivate Cream

Hello Doctor, I was using Melalite forte and flutivate cream with doctors prescription for more than 5 years for removing dark spot and lightening. after using approx. 3 months all dark spot goes and skin become fare. but after stopping it come back again. what should i do. secondly flutivate is no more available. any suggestion to keep my skin fairer.