Head and neck dermatitis, a subtype of atopic dermatitis induced by Malassezia spp: Clinical aspects and treatment outcomes in adolescent and adult patients.

This study delineates two HND clinical phenotypes: adolescent vs adult onset. Different characteristics were observed in terms of relationship to AD and eczema localization. A history of AD in childhood and presentation with exclusive involvement of head and neck regions was observed predominantly in the adolescent-onset form, while adult-onset HND often occurred in association with diffuse dermatitis and a past history of AD was less frequent than in the adolescent group. The study is limited by the single-center retrospective nature, which may lead to diagnostic and selection biases, and the small cohort of patients.