A Study of Azelaic Acid (AzA) 15% in Topical Treatment of Mild to Moderate Perioral Dermatitis

Inclusion Criteria: * Clinical diagnosis of mild to moderate perioral dermatitis as diagnosed by the physician * Investigator's Global Assessment (IGA) score at baseline of 2 or 3 (on scale from 0 to 4) * 8 to 50 facial inflammatory lesions (papules, papulopustules, papulovesicles) Exclusion Criteria: * History of atopic dermatitis of the face * Granulomatous perioral dermatitis * Facial acne, rosacea, facial demodicosis * Seborrheic dermatitis of the nasolabial fold, Lupus erythematosus * The use of topical or systemic medications that could affect the course of treatment and/or evaluation * Severe diseases likely to interfere with the conduct / planned termination of the study (e.g. cancer, cardiac infarct, unstable angina pectoris, uncontrolled diabetes) * Use of fluorinated toothpaste * Planned exposure to artificial or intensive natural UV light of the test area throughout the course of the study * Use / planned use of cosmetic products (e.g. creams, moisturizers, make-up, fatty lipstick) in the test area during the course of the study * History of or suspected hypersensitivity to any ingredient of the study drugs * Participation in another clinical study 4 weeks prior to and/or during the conduct of this study