What can i do if i had an allergic to hair dye? how to make the symptoms go away?

Challenging: Contact dermatitis to p-phenylene diamine is one of the most common allergies to hair dye. Symptoms are usually a red itchy rash that persists sometimes up to a month. Avoidance is the most effective treatment, allergy patch testing can confirm. Sometimes, treatment can require oral prednisone, but this has potential side effects. Some can get allergy to preservatives in topical corticosteroids

Avoidance: Avoidance is the only answer. For the acute situation, a potent topical cortisone lotion or spray (by rx) would be the answer.