Contact haptens in emollients marketed in two European countries (Poland and Spain)

Atopic dermatitis (AD) is the most common skin disease among pediatric patients, which affects up to 20% of children worldwide. Characterized by pruritus and eczema, it is also associated with improper skin barrier function and allergen sensitization. Here, we aimed to assess the presence of haptens in emollients marketed in two European countries: in Poland and Spain, as, firstly, these products are considered to be AD's basic therapy, and, secondly, frequent application of potent sensitizers on atopic skin may result in contact dermatitis. We systematically searched for moisturizers explicitly described as “Atopic skin care” products in the most frequently visited online pharmacies in Poland and Spain. Subsequently, we created a database of all products and compared their composition with 139 contact haptens listed in the European Baseline Series (EBS), Fragrance and Cosmetic Series. As of December 2018, our list comprised 159 and 111 emollients available on the Polish and Spanish markets, respectively. There were no ingredients listed in 28 (17.5%) products in Poland and 24 (21.6%) in Spain. Only 23 (17.5%) and 13 (14.8%) products were hapten free. The pattern of most common haptens was similar in both countries, including phenoxyethanol, tocopherol and tocopheryl acetate, undefined parfum in Poland and tocopherol, phenoxyethanol, tocopheryl acetate and undefined parfum in Spain. This study shows that a vast majority of products taken into consideration contain at least one potential contact hapten. These findings indicate a need for patient education about potentially allergenic ingredients and stronger cooperation between academia and cosmetic manufacturers.