How to free my head from dandruff? Sometimes it rash a lot :/ any solutions please I shampoo my hair one or twicea week

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 kenalog (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 scalp symptoms.