How to try skin care products is it allergic?

The skin allergy test method of cosmetics is very simple. Soak a piece of gauze in distilled water or physiological saline, twist it to half dry, and fold it into four layers of about 1 cm2. Apply cosmetics to one side of gauze, and apply it to the normal skin of forearm extension or back, then cover it with airtight cellophane or plastic film of 1.5 cm2 and fix it with adhesive tape.

After 24 ~ 48 hours of observation, if the test site is itchy or burning, indicating that the cosmetics are irritating to the skin, it is a positive reaction, and the test substance should be taken out in time and washed with clear water.

If there are no symptoms at the test site, it is a negative reaction, indicating that the cosmetic is non-irritating to the skin and relatively safe.

If there is simple erythema and itching, it is weakly positive; Redness and papules are moderately positive; If there are obvious redness, papules and blisters, it is strongly positive; It is very positive that there are obvious blisters or even necrosis. If there is a positive reaction, it needs to be cleaned and treated in time. It is recommended not to use this cosmetic.

Extended data

Self-detection method of sensitive muscles;

Allergic skin has specific allergens, including internal factors and external factors. The internal factor is eating irritating food, such as seafood, alcohol and some fruits, which leads to allergic phenomena such as itchy skin and redness.

External factors may be smoke, ultraviolet rays, pollen and dust in the environment, or the essence and chemical preservatives in cosmetics may cause skin allergies. In addition, seasonal alternation, excessive tension or fatigue can also lead to skin allergies. Generally speaking, the following six symptoms can be seen in the self-detection of sensitive muscles:

Symptoms 1: Skin desquamation.

Sudden appearance of rough or peeling skin means that your skin is sensitive. Simply put, the skin is short of water. The maintenance method of this kind of skin should keep the skin moist, use mild fragrance and oil-free skin care products, and especially avoid alcohol or other ingredients that are too irritating.

Symptom 2: The skin is quite sensitive to cold and heat.

Whenever the season changes, sensitive muscle girls will encounter skin discomfort again. Avoid washing your face with too hot or too cold water, and make sure that your skin has been coated with sunscreen products before going out to avoid direct exposure to ultraviolet rays.

Symptom 3: The face is covered with pimples or acne.

What girls with sensitive muscles don't like most is the pimples and comedones on their faces. To solve this thorny problem, we must first ensure that there are two steps: washing your face thoroughly and removing makeup every day.