The top selling skin treatments are actually for the scalp and it is for dandruff. For many years scientist have searched for the actual cause and recently found that is was a fungus called malassezia and this is why many of the medicated shampoos like selsum blue and head and shoulders can help to knock down dandruff but ironically when it comes to really getting rid of dandruff and all of the symptoms including the itching, flaking and other irritations including redness the best ingredients are natural based. the makers of Selsum blue and Nizoal do not want you using their products long term as it can cause health problems but the makers of natural dandruff shampoos do not care if you use them long term as their are no side effects. Ingredients like thyme, sage and even fenugreek can all help to kill dandruff on the spot, there fore we say go after the natural dandruff shampoo products and let those get to work on the actual cause of dandruff.