Fragrance Categories in Skin Care for Atopic Dermatitis: A Practical Framework for Clinicians

Fragrance-free skin care is widely recommended for patients with atopic dermatitis (AD) because barrier dysfunction increases vulnerability to irritant and allergic contact dermatitis. However, fragrance and odor-relevant ingredients encompass heterogeneous synthetic, botanical, and plant-derived compounds with differing sensitization potential, biological activity, and clinical implications. This review evaluates fragrance classification, sensitization risk, anti-inflammatory and barrier-supportive mechanisms, clinical efficacy and safety, and regulatory and labeling considerations relevant to AD. Synthetic fragrances and essential oils carry the greatest sensitization risk. Hydrosols, naturally scented botanicals, and deodorized plant-derived emollients may have lower sensitization potential and possible anti-inflammatory benefits, although AD-specific clinical evidence remains limited. Product labeling further complicates counseling because terms such as “fragrance-free,” “unscented,” and “hypoallergenic” are inconsistently defined and may not reliably exclude allergenic exposures. Fragrance avoidance remains appropriate for patients with active dermatitis or confirmed fragrance allergy, but fragrance and odor-relevant ingredients should not be treated as a uniform risk category. A provisional risk-stratified framework incorporating ingredient composition, formulation quality, disease activity, sensitization history, patch-test results, and patient tolerance may support individualized counseling while maintaining clinical safety.