How long does hair dye allergy appear symptom?

summary

There is a chemical substance called "p-phenylenediamine" in hair dyes, which is easy to cause harm to human skin. The more frequent hair dyeing and the closer contact between chemical reagents and scalp, the greater the harm to the body and the greater the probability of hair dye allergy. How long does hair dye allergy appear symptom? Let's talk about it

How long does hair dye allergy appear symptom?

Hair dye allergy usually occurs 2 to 5 days after hair dyeing. If it is not the first time, symptoms may appear within a few hours. Hair allergy is generally related to benzene, depending on the quality of the hair dye itself, the number of times you dye your hair and the time you contact the preparation. Different people have different time.

The symptoms of hair dyeing allergy are usually skin redness and swelling, itching and rash on the head and limbs after hair dyeing. In severe cases, anaphylactic shock may occur, which is life-threatening. Hair dye allergy is protracted and difficult to treat, and will suffer from hair dye dermatitis (a kind of contact dermatitis).

According to the skin allergy symptoms caused by hair dyeing allergy, experts suggest that before hair dyeing, consumers should do an allergy test before hair dyeing. Before each hair dyeing, consumers should first choose a handful of hair behind the ear root for allergy test. If there is any abnormality, they can choose other brands to re test. If there is still allergy, they should give up hair dyeing.

matters needing attention

Choose a regular hair dye, before dyeing hair, you must see clearly the precautions, and also pay attention to, don't mix different hair dyes together, in order to avoid unexpected consequences, and then if the scalp has broken skin or itself is allergic constitution, then try not to dye hair.