It s hard to say. Offhand it sounds like seborrhea or eczema. However, the Nizoral is clearly for a fungal infection - not these conditions. Either the dermatologist was incorrect or you have two problems. When you use the Head and Shoulders, apply it in full strength and allow it to stay on your scalp for as long as possible.
Some patients even wear shower caps and keep it on overnight.
This should help. However, I'd see the dermatologist again. I have had this condition for years. I have been to numerous doctors, but no one seems to know what it is. These sores have caused bald spots in two areas on my head.