Immunology: A Quick Guide.- Clinical Features of Contact Dermatitis.- Patch Testing: Essentials.- Patch Testing with Own Products.- Allergic Contact Dermatitis: Clinical Relevance and Exposure Assessment of Allergens.- Irritant Contact Dermatitis: Diagnosis and Risk Factors.- Photoreactions and Testing.- Protein Contact Dermatitis and Testing.- Occupational Contact Dermatitis.- Contact Allergy in Children.- Main Allergen Groups: Metals.- Fragrances.- Preservatives. Allergens in Various Products: Textiles and Hair Dyes.- Dental Materials.- Shoes/Gloves.- Glues.- Metalworking Fluids.- Plants.- Cosmetics.- Workers Protection: Gloves, Creams.- Overview of Allergens.