cosmetic dermatitis
Introduction
Introduction to cosmetic dermatitis Cosmetic dermatitis (cosmeticdermatitis) is caused by the use of contact cosmetics (including emollients, whitening, sunscreen, ecchymoses, hair care conditioners, lipsticks, and other cosmetic cosmetics foundations, oil paints, qualitative powders, gouache, etc.). Skin inflammatory reactions, including hair dermatitis, oil dermatitis and cold dermatitis. basic knowledge The proportion of illness: 1% Susceptible people: no specific population Mode of infection: non-infectious Complications: pruritus
Cause
Cosmetic dermatitis cause
(1) Causes of the disease
There are many kinds of substances that cause dermatitis in cosmetics, mainly the following:
1. Antiseptic fungicides: such as para-phenol, chlorofluorophenylurea, trichlorocarboylaniline, trichlorodiphenylurea, hexachlorophenol, dithiophenol, etc., wherein dithiophenol has a photoallergic effect.
2. Pigment: mostly caused by tar pigment, commonly red 219 (Sudan phenyl azo-naphthol), red 505 (Sudan II), red 221 (toluidine red), yellow 204 (quinine yellow).
3. Perfume: There are two major categories of chemical synthetic agents and natural preparations, such as benzyl salicylate, ylang-ylang oil, pure jasmine, bergamot oil and the like.
4. Cosmetic base: lanolin, propylene glycol, surfactant, two-sided active agent, etc.
5. Hair dye: mainly contains hydroquinone, which is a strong sensitizer. The cold scalding liquid mainly contains thioglycolic acid, thioacetic acid, dilute ammonia solution, and caustic soda.
6. Containing drugs or herbal cosmetics: Among them, chemical drugs and Chinese herbal medicines are haptens themselves, the pathogenesis is the same as that of contact dermatitis, most of them are allergic, belonging to type IV allergic reaction, a few are type I and photoallergic reactions, and irritants include Stimulation, inferior quality and denatured cosmetics, some fake cosmetics contain lead, mercury and other impurities, causing sensitization or stimulation.
(two) pathogenesis
Antiseptic bactericide Dithiophenol has a photoallergic effect. Chemical drugs and Chinese herbal medicines are haptens themselves. Sensitization or stimulating effect is the pathogenesis of this disease. Like contact dermatitis, most allergic reactions are type IV allergies. A few are type I and photoallergic reactions.
Prevention
Cosmetic dermatitis prevention
Avoid contact with cosmetics again, avoid direct contact with strong sunlight and keep your skin clean.
1. Before using cosmetics, in order to avoid causing reaction, it is best to first test the skin patch, apply a little cosmetic to the inner skin of the forearm, about (0.5 ~ 10) cm × (0.5 ~ 10) cm, overlying cellophane, then Fix with tape or bandage and observe for 24, 48 or 72 hours. If there is redness and swelling, the reaction of blister is positive, it should be avoided. If there is no reaction, it is negative, indicating that it can be applied.
2. When the face has eczema, dermatitis, hemorrhoids or other skin diseases, it should be actively treated in the hospital, it is best not to use cosmetics, so as not to make the original skin disease worse, or cause adverse reactions.
Complication
Cosmetic dermatitis complications Complications pruritus
The disease is caused by the body's allergies to certain ingredients in the cosmetics, so it is mainly complicated by redness and itching of the skin. Often due to scratching the skin, due to the destruction of skin integrity, it can be caused by skin bacterial infection or fungal infection, usually secondary to low body, or long-term use of immunosuppressants and fungal infections such as nail fungus Such as concurrent bacterial infections may have fever, skin swelling, ulceration and purulent secretion and other performance. Severe cases can lead to sepsis, which should be brought to the attention of clinicians.
Symptom
Cosmetic dermatitis symptoms Common symptoms Itching papules pustules
Dermatitis type
In the contact area, more common erythema, swelling, papules on the face, blisters, erosion, exudation, etc., sensation of burning or itching, hair dye dermatitis in addition to the head, the face, the trunk can also occur, caused by cold perm The dermatitis occurs in the fingers. Because of long-term contact with the occupation, the nails are also affected, thinned, softened, and the edges of the nails are lifted or the deck is peeled off.
2. Pigmentation type
After the dermatitis subsided, the pigmentation was left behind. It was also found in the long-term application of a cosmetic for 1 to 6 months. The facial pigmentation was deep, showing grayish brown spots, generally no symptoms, and sometimes mild itching.
3. Acne type
Long-term application of a certain kind of cosmetics (especially lipid cosmetics) 1 to 3 months after the appearance of a pimples or pustules on the face consistent with hair follicles, sometimes based on light acne, after the use of cosmetics increased.
4. Photosensitive dermatitis type
Applying cosmetics (such cosmetics contain certain photosensitivity substances), after exposure to sunlight or ultraviolet rays, the same as dermatitis type, redness, papules, blisters, etc., the type is prone to pigmentation spots.
Examine
Cosmetic dermatitis examination
Clinical skin examination: more common erythema, swelling, papules on the face, blistering, erosion, exudation, etc., often accompanied by obvious itching, leaving pigmentation.
Laboratory examination: The proportion of eosinophils and the number of eosinophils were significantly increased in blood.
Diagnosis
Diagnosis and differentiation of cosmetic dermatitis
Generally, it is not difficult to diagnose, according to the history of use or contact, the part, the application will disappear after stopping the application, and the contact will occur again. It is mutually differentiated from other allergic dermatitis.
