[Science] Must see! Some basic questions about cosmetic allergy

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Skin care and makeup are part of the daily life of many women, but we often encounter such a phenomenon in skin care and makeup- allergies . The last article of

Xiao Run has mentioned some small knowledge about sensitive muscles, but this article is actually a little related to the previous one, because cosmetic allergies are also one of the reasons for the acquired skin to become sensitive.

Then, Xiaorun will focus on those things about cosmetic allergies~

01

What is cosmetic allergy?

Usually, after we use skin care products and cosmetics, the skin has subsequent adverse reactions. We call this phenomenon a cosmetic allergy.

And such adverse reactions include cosmetic contact dermatitis, cosmetic light-sensitive dermatitis, cosmetic acne, cosmetic skin pigment abnormality, cosmetic hair damage.

Many people think that cosmetic allergies must be the cause of cosmetics, but there are actually many reasons for cosmetic allergies: the use of products, the frequency of use, the concentration of irritating ingredients, and the skin's defense against irritants.

02

What are the general allergic reactions?

1. Contact dermatitis

Generally, contact dermatitis caused by cosmetics accounts for 5~10%, and contact eczema caused by 2~5%. Cosmetics in this case include: skin care products, hair products and make-up products, followed by nail polish, perfume, cleaning products, shaving products and sunscreen products.

Because most of these products contain fragrances and preservatives, the most common allergens in all cosmetics are fragrance ingredients and preservatives. Friends who are often allergic can check the ingredients in the products they use.

2. Lipitis

Lipitis is generally an irritating reaction of the skin to lipstick products. In addition to fragrances and preservatives, the allergens of lipsticks may also be solvents that dissolve pigments. The oils, fats, and cocoa butter contained therein Impurities are also one of the causes.

3. Perioral dermatitis

Perioral dermatitis was first thought to be related to photosensitivity, and it is a periodic attack, but now it may also be caused by moisturizing cream, night cream and facial cleanser, etc. Perioral dermatitis, which may manifest as rosacea , Symptoms of mild itching on the face.

4. Light sensitivity

Skin allergies are divided into two types: phototoxicity and photosensitivity.

Phototoxicity is a skin reaction caused by the combination of cosmetic ingredients/photosensitive foods and sunlight. This one has nothing to do with immunity. So if there is an allergic phenomenon, it is not necessarily the skin care product/cosmetics problem, but there are ingredients that need to be protected from light, and I happen to ignore this. The clinical symptom is that the skin area exposed to the sun is rapidly inflamed and subsided fast.

and photosensitivity dermatitis usually only reacts after exposure to the sun for a period of time, and the diseased area not only includes the location of the sun, but also spreads to other areas.

03

Common allergens in cosmetics

heavy metals

Here, heavy metals mainly refer to some cosmetics/skin care products with exfoliating and whitening properties of lead and mercury content exceeding the standard.

perfume

perfume is the most common allergen in cosmetics. Most eczema patients with cosmetic allergy are caused by perfume.

The current research has found that there are about 20 kinds of fragrance ingredients that are prone to allergies, including: jasmine flavor, new international flavor, tuberose type A flavor, white rose flavor, lilac flavor, osmanthus flavor, etc.

Friends who are often allergic can self-check whether the products they use contain certain allergenic fragrances.

preservatives

general preservatives include imidazolidinyl urea, parabens, bromopol, and formaldehyde. my country’s laws and regulations stipulate that cosmetics can only be selected from 55 allowed preservatives, but these 55 Not all species are safe.

is like the aforementioned formaldehyde. Although it is allowed to be added to cosmetics, it is also a source of allergies.

04

use cosmetics without quality problemsAlso allergic?

Cosmetics that have no quality problems may also be allergic. The reasons are as follows:

uses skin care products/cosmetics when there is skin inflammation.

superimposes the use of different brands of skin care products (they may have mutual ingredients. Rejection phenomenon)

uses inferior cosmetics/skin care products, overuse/improper use of skin care products

basically uses cosmetics without quality problems and is allergic, most likely it is improper selection of cosmetics. For example, people with oily skin should try not to use skin care products that are too moisturizing. Obstruction of skin excretion can cause clogged pores and form blackheads or inflammatory papules.

Therefore, it is very necessary to choose products that suit your skin.

05

How to avoid the "rotten face" caused by cosmetic allergy?

Xiaorun found that many fairies do not have the habit of allergy testing when buying skin care products/cosmetics. The easiest and easiest is to take an appropriate amount of the product and apply it to the ear, and continue to observe for 24 hours to see if there is any allergic symptoms.

Of course, there is also a more professional and accurate test operation: take a piece of gauze soaked in salt water/distilled water, fold it into a small piece, apply skin care products/cosmetics to one side of the gauze, stick it to the arm position with tape, and observe for 24-48 hours After the skin reaction.

If there is redness, itching, blisters, etc., it is positive, immediately wash the remaining supplies; if there is no reaction, it is negative, then the cosmetic/skin care product can be used.

06

Key point: What should I do if I have allergic symptoms when using cosmetics?

When skin allergies occur, the first thing to do is to stop using the product immediately; if you are not sure about the product, it is recommended to stop all the products you use. If the symptoms are not relieved within 1-2 days, you should seek medical treatment in time, and do not apply it yourself ointment.

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