How To Cure Blemishes On Face?

doctor my problem is am having dark spots on my face both sides , since am taking pills i notice dark spots started one by one and it can bother me to think about this , i used many type of creams but its useless not disappear , my friend she told me to use betamethasone ointment , then i tried and i noticed not so dark and if i stop to use again it will become ing dark , doctor please give me the right cream to use