hi jon jones, I think you are facing scalp psoriasis or sebarrhoic dermatis.It looks similar to my story.I suffered this same problem for about 13 long years.Initially i thought that this could be a dandruff problem and someone told me to rub lime on the scalp which actually cures dandruff but that was of no use, I used all kind of oils, herbal rememdies but everthing went invain. Then i applied anti dandruff shampoos for 10 years but still the problem persisted.Then i consulted one good dermatologist, he told me that it is scalp psoriasis and this can only be cured if we keep our head clean and tidy, there can be no.of reasons for this problem but the solution would be wash your hair daily with antibacterial soap and any good coaltar shampoo.