how can i cure my dry scalp

About 2 years ago i was helping a friend whos car had over heated and she opened it when it was still to hot and didnt say anything and when i turned around it popped off and engine coolant and steaming hot water busted all over my face hand and front part of my scalp… im fine no major scars except my hand but since the accident my scalp is really dry where i had gotten burned and nothing ive tried will work. It gets big white flakes and is still very tender after i wash my hair. And brush it too.