How To Remove Dandruff On Scalp And Pimples On Face?

Hi, doctor I am experiencing dandruff problem from last three years, due to that my hair has also become thin and whenever i stracth my head dandruff comes into my nails. i have scalpee lotion, it was good but i want to completely cure my dandruff. because due to dandruff my face is also affected i have small pimples on my forehead and cheeks which i think is because of dandruff because my was good before i had thid much of dandruff and i had tried erytop for my pimples they were reduced but when i stop applying it they came back. what should i do? please advice and help me out