your scalp issues cannot be accurately diagnosed over the internet based on description. a medical provider would need to see and examine you in order to make this determination. you could have seborrheic dermatitis or perhaps a dozen other skin/hair conditions. my suggestion is for you to see a good dermatologist and get it diagnosed and treated by an expert.
my scalp itches severely (even after washing) occasionally gets hard crusty build ups and my hair is weak and breaking. i have eczema that has always only been able to be treated with a prescription. my scalp gets really itchy and dry and my hair breaks off in patches. what could this be?