Talk to Dermatologist on Scalp Dye Reaction

I am suffering from a bald patch on scalp after using hair dye since two months. It is a chemical burn kind of thing. I have used corticosteroid creams etc but have not noticed regrowth yet. There is irritation, itching or pain in that area which was the case in the first couple of weeks. Please suggest any suitable oinment//cream which could resolve this issue.