The reason that it can become tricky is because the fungus and bacteria can actually get down inside the hair follicle and hide behind things such as hardened sebum o even dirt and sebum plugs or clogged hair follicles. This allows the bacteria to proliferate. The result is a serious build up of these and the itching, tenderness, flaking and much more can get out of hand.
This is also why most traditional and even medicate shampoos don't work. They don't ever actually reach the root of the problem. To get the scalp back to healthy it is out belief that we need to open up these clogged hair follicles that cause a tender scalp problem. We also believe that the follicles must then be irrigated and purified