Contact allergy to cosmetics: causative ingredients.

Area of Science:

• Dermatology
• Allergology
• Cosmetic Science

Background:

• Contact dermatitis is a common skin condition.
• Cosmetic products are frequently used daily by a large population.
• Identifying allergens in cosmetics is crucial for patient management.

Purpose of the Study:

• To investigate the prevalence and causes of contact dermatitis due to cosmetic products.
• To identify the most common cosmetic product types and ingredients responsible for allergic reactions.
• To evaluate diagnostic methods for cosmetic-induced contact dermatitis.

Main Methods:

• Retrospective analysis of 1781 patients with contact dermatitis over a 6-year period (1981-1986).
• Detailed patient history collection focusing on cosmetic product use.
• Diagnostic procedures including patch testing, use tests, and repeated open application tests.

Main Results:

• 4.2% of contact dermatitis cases were linked to cosmetic products.
• The face, particularly eyelids, was the most frequently affected area.
• Skin care products were the primary cause (52.3%), with fragrances (45.1%) and Kathon CG (11.0%) as key allergens.

Conclusions:

• Cosmetic allergies are a significant cause of contact dermatitis, often affecting the face.
• Fragrances and preservatives are major allergens in cosmetic products.
• Mandatory ingredient declaration on cosmetic labels is recommended to aid diagnosis and prevention.