A dermatologist may be able to help you. I had problems for years with itchy, rough skin and itchy bumps on my scalp. Lice treatments didn't help. Eventuslly I found that I had gluten intolerance (Celiac Disease) and since I've been on a strict gluten free diet I haven't had the problems with my skin. People report problems similar to yours that are caused by scabies and the mites can be difficult to get rid of.