Why does hair dye cause skin allergies?

Each person has different sensitivity to various substances. Individuals will show allergic symptoms when exposed to certain substances in hair dyes, such as erythema, itching, exudation, etc. Medical adhesive tape allergy belongs to contact dermatitis, and contact materials should be removed immediately, and topical hormone antipruritic drugs or oral anti-allergic drugs. Decoration allergy is caused by the substances emitted by decoration materials contacting the skin, causing skin redness, itching, etc., and substances inhaled by the human body can also cause acute symptoms such as breathing difficulties.