You should consult dermatologist
You might developed irritant contact dermatitis
due to dye.
For ever, you forget to apply dye.
Dye contains notorious chemical PPD , you may be knowing.. which is responsible to cause ICD.
YOU MAY APPLY SIMPLE PLAIN MEHDI...OK
Now you have only burning sensation on scalp and side of face.. Right?
Take fuoxetin 10 mg, vitamin B12 and Pain killer till you feel better.
I think, you might be having Herpes Zoster
, undiagnosed.. Now healed leaving burning sensation..post herpetic neuralgia
... You may take gabapentin or pregabalin..if. Not relieved...consult dermatologist..ok
I hope you got my answer.
Dr. Ilyas Patel MD