Ive been using anti dandruff but doesnt work and its at its worst after washing my hair and i use conditioner.. sometimes is soft yellow white layer is also present ?

Controlling dandruff: Dandruff (seborrhea) is common. Shampoos with zinc, salicylic acid, selenium, or coal tar are sold in many stores. Nizoral shampoo (contains anti-fungal) is also available. Doctors may also recommend cortisone or triamcinolone sprays. Prevent dryness (don't wash hair too often). A primary doctor or dermatologist can look for psoriasis, eczema, or fungal infections if unusual or worrisome symptoms.