How can i get rid of pimples on forehead caused by dandruff in oily hair?

Keep oily hair: away from forehead. Wash hair daily to prevent dandruff. Try anti-dandruff shampoos that contains zinc pyrithione, which can reduce the scalp fungus associated with dandruff; selenium sulfide, which can limit cell turnover and possibly even decrease the amount of fungus; salicylic acid, which works as a sort of scrub to slough off dead skin.