Skin Is Too Dark Only On My Face

heelo sir, m 28 yr old, my skin is too dark only on my face , not in whole body so i had consulted a doc who suggest me to take some kind of isotroin 20, acutret and some creams as skinlite/metasone plus, from 1.5 yrs i hv taken that but last 6 months i leaved them, due to which my skin get effected as too dark and oily,. plz suggest me what can i do for that plzzz...... i think these tabs are effecting to my skin, plz tell me also, what are side effect of that. some time i feel too depressed too, i had taken regularily these medicine but from from sometimes i had stopped this by which i m facing these problem. m telling u what tabs i had taking as prescribed by cosmatologist doctor Isotron 20, Acutret cream, metasone plus cream, skinlite cream, Hyclene cream Plz do needfull doc thanxx