Allergy to cosmetics and cosmetic

Considering that about 4% of the population have an allergy to cosmetics. Specifically, what are the components of cosmetics that cause allergies. Thus, one can be allergic to a specific component, and very well tolerate the others. Very often, people who are a mild reaction after trying a merely cosmetic change it.Allergens in cosmetics
The components of cosmetics can therefore fulfill a role of allergen. Allergy to a beauty product is often allergic to a preservative. The Conservatives are most common allergens and their liberators formaldehyde, parabens, antioxidants and UV absorbers. Allergy can also be caused by other components such as fragrances (perfumes). Other products are also reported as allergens: glycerin and glycol, lanolin, castor oil, betaine cocamidropropyl, propolis resin, pigments, PPD, resins, shellac, panthenol ...Delayed symptoms of allergy to cosmetics
Allergy to cosmetics can cause very different manifestations. The most common symptom is a delayed hypersensitivity reaction. Allergy will trigger slowly, and will sometimes detected only 1 to 2 days after application. This reaction occurs in the form of eczema, which may be vesicular or papulopustular dry and cracked. In smaller cases, the skin will just be covered with a rash. Itching can also occur (pruritus). The hypersensitivity reaction may in fact cause different types of skin rashes, and even a sensitivity to light (photosensitivity).Immediate reactions of allergy to cosmetics
There are also cases of immediate reactions to the application of a cosmetic. The skin is covered instantly erythema or urticaria. Very rarely, anaphylactic shock can occur. In France, thirty cases are reported each year to AFSSAPS (French Agency for Sanitary Safety of Health Products). Finally, cosmetics can also cause irritant dermatitis. This is a skin reaction, located in the area where the product was applied. The skin becomes red, pull, and a plaque cracks may appear.Allergy to cosmetics, a difficult diagnosis
Most allergies to cosmetics are never diagnosed. Indeed, before a skin reaction, it generally tends to change the cosmetic, without trying to learn more. Only if significant symptoms or severe (anaphylaxis) that a diagnosis will be sought. This is all the more difficult it is not always clear which product caused the reaction. Now, we use between 5 and 20 cosmetics every day. Not to mention that each of these products contain dozens of substances, which are all potential allergens. The diagnosis can be long and complicated. And a person may be allergic to a cosmetic component, as many of them ...