I have been having pretty bad dandruff i always scratch off the dandruff. i use head and shoulders but it doesn't work what else can i use?

Coal tar solution: An effective treatment for dandruff is a solution containing up to 10% coal tar - see your local chemist to see what they have available. The principle is to apply the solution to the scalp in a lather and leave it on for an hour, before washing off with shampoo. Do this nightly for one week, then repeat every 1-2 weeks when needed. If dandruff persists, see your doctor.

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 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.