Hello. Welcome to ask the doctor.
If you are allergic to hair color, the best is to avoid its application.
If it is unavoidable, oral antihistaminics prior to application of hair color can be taken.
However, prevention is always better than cure.
Follow my advice under your Doctor's supervision.
I hope it helps.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.