Pigmented cosmetic dermatitis
Introduction
Introduction to pigmented cosmetic dermatitis Pigmented cosmetic dermatitis (pigmentedcosmeticdermatitis) is a local skin pigmentation reaction caused by allergy to cosmetic ingredients. basic knowledge The proportion of illness: 0.02%-0.05% Susceptible people: no special people Mode of infection: non-infectious Complications: pruritus
Cause
Causes of pigmented cosmetic dermatitis
Cause:
Fragrances, preservatives and emulsifiers in cosmetics are the main allergens causing skin irritation in cosmetics, causing pigmentation after facial inflammation. This inflammatory reaction may be a contact or phototoxic reaction caused by direct stimulation, or may be sensitized by the skin after frequent use and long-term contact, and manifested as type IV allergic reaction. In addition, ultraviolet radiation, wind blowing, air drying and moisture can be the cause of the disease.
Pathogenesis:
These allergens are generally low in commercial products, but can produce significant contact allergies and/or photosensitivity, are often used, gradually absorbed into the skin and accumulate over time, causing mainly in the epidermal base. Type IV allergic inflammation in the bottom layer causes the disease.
Prevention
Pigment cosmetic dermatitis prevention
Avoid using and disabling any cosmetic skin care products that contain contact allergens and/or photoallergens.
Complication
Pigment cosmetic dermatitis complications Complications pruritus
Pigmentation affects the face of women.
Symptom
Pigmented cosmetic dermatitis symptoms common symptoms pigmented itching
The skin lesions begin with a pale brown spot, which can be deep brown, blue-black or black, diffuse or patchy, mainly distributed in the cheeks and/or forehead, and the weight can be extended to the entire face. In the center of the pigmented plaque, it tends to be a reticular structure. It can be repeatedly sensitized at the beginning and the course of the disease, and there is mild contact dermatitis reaction. It is also itching from time to time. This disease mainly affects the woman's face, and is mostly yellow.
Examine
Examination of pigmented cosmetic dermatitis
The following tests are helpful for the diagnosis of this disease and can identify the allergens: cosmetic product patch test and spot patch test, cosmetic product application test and repeated open application test (ROAT), standard screening antigen (or European antigen, another Patch test and spot patch test of added series of antigens.
Histopathology: liquefaction denaturation of epithelial basal cells, pigment incontinence with accumulation of melanin particles in macrophages of the upper dermis, and moderate or mild infiltration of lymphocytes and histiocytes around the upper blood vessels of the dermis.
Diagnosis
Diagnosis and differentiation of pigmentary cosmetic dermatitis
According to the performance and distribution of facial skin lesions, the skin lesions are consistent with the use of cosmetic parts, and the history of allergies to cosmetics. After the suspicious cosmetics are stopped, the skin lesions are obviously improved or subsided, and the diagnosis of the disease can be made. The following tests can help. The diagnosis of this disease and its allergens: cosmetic product patch test and spot patch test, cosmetic product application test and repeated open application test (ROAT), standard screening antigen (or European antigen, plus series of antigens) Patch test and spot patch test.
Need to be differentiated from chloasma, pigmentation after facial contact dermatitis.
