Everyone has the love of beauty, and dyeing hair has become the best choice for many people to change their image and pursue fashion. Especially during the holidays and festivals, more people dye their hair. Not only to cover the white hair, many young people also like to dye their hair into their favorite color, which is fashionable and beautiful. But have you considered the health risks of hair dyeing?
How hair dye can change hair color
Hair dyes are classified into temporary hair dyes, semi-permanent hair dyes, and permanent hair dyes according to the length of time they color the hair. According to the principle of hair dyeing, it can be divided into oxidative hair dye and non-oxidative hair dye. At present, most of the hair dyes used daily are oxidative hair dyes.
The principle of oxidative hair dye hair dyeing is to first make the small molecule aniline colorant precursor and the coupling agent penetrate into the loose hair, and then oxidize and polymerize under the action of the oxidant, thereby generating macromolecular pigments that are not easy to leave the hair. , Enclosed in the hair fiber, make the hair show the corresponding color for a long time.
How to avoid dermatitis
Dermatology clinics often have some patients with dermatitis. Among hair dyes, p-phenylenediamine is a relatively common contact sensitizer, which can easily cause allergic symptoms.
Hair dye dermatitis belongs to contact dermatitis. People who dye their hair for the first time develop symptoms after 2 to 3 weeks of sensitization, and those who dye their hair again may develop symptoms 1 to 2 days after exposure to hair dye. Mild cases are manifested as redness, swelling, papules, tingling, itching, etc. at the contact area, while severe cases may develop blisters, erosions, oozing, and even spread all over the body.
What are the conditions that easily cause hair dye dermatitis?
First, an unqualified hair dye was used. Second, change the hair dye frequently. Third, they belong to people with allergies.
So, is there a way to avoid hair dye dermatitis?
First, buy hair dyes produced by regular manufacturers. Qualified hair dye products must be approved. Domestic hair dyes should be marked with National Makeup Special Year No. XXX, and imported hair dyes should be marked with National Makeup Import Year No. XXX. The concentration of irritants in regular hair dyes is not high, and the harmful substances do not exceed the standard, and the probability of causing irritant contact dermatitis is relatively small.
Secondly, you can do a test before dyeing your hair. Apply a little hair dye behind the ears or inside the wrists and observe for 48 hours. If there is no redness, itching, rash, etc., or general discomfort, use it. If you are allergic to the previously used hair dye, do not use it again.
Third, ensure a healthy scalp. If the scalp has wounds, skin inflammation, etc., do not dye your hair first to prevent irritation and penetration of hair dye. When dyeing hair, pay attention to protecting the face and the skin behind the ears, and avoid getting too much hair dye on the scalp and other skins of the body. Rinse as much as possible after dyeing to avoid residual hair dye.
Fourth, people with allergies must be cautious when choosing hair dyes.
Fifth, try to use safe products that have been used before, and don’t change the brand of hair dye frequently.
In the event of an allergic reaction, you should immediately wash away the remaining hair dye on your hair and skin with mild water. It is best to wear gloves when rinsing to protect the skin on your hands. Shortening the hair can eliminate the dye on the hair and prevent the continued absorption of allergies. Anti-allergic drugs can be taken orally. For more serious patients, hormones are also needed.
Will hair dye cause cancer?
In addition to allergies, people are also generally concerned about whether long-term use of hair dyes will cause cancer.
At present, the correlation between hair dye and tumorigenesis has not been clearly confirmed. As long as we choose hair dyes produced by regular manufacturers and use them correctly, the risk of cancer is minimal, so we don’t need to worry too much.
Another question is, will dyeing hair cause hair loss?
Hair dyeing generally does not cause hair loss. However, the various substances in the hair dye may stimulate the scalp and cause inflammation of the scalp and hair follicles. Over time, the hair follicles atrophy and the hair changes from thick to thin, and hair loss occurs.
In addition, hair dyeing will affect the quality of the hair, especially those who frequently dye the hair, and the hair is prone to dryness, roughness, and breakage. Therefore, people with hair loss tendency and poor hair quality are not recommended to dye their hair.