This study is consistent with previous cohort studies on antibiotics and atopic eczema.[2],[3] Further research is needed to clarify the causal mechanisms by which antibiotics may affect the risk of atopic eczema. Https://doi.org/10.1093/bjd/ljac108 Dear Editor, Atopic eczema is a chronic, systemic inflammatory disease characterized by itchy, inflamed cutaneous lesions.[1] Recent studies have suggested a potential role for antibiotics in atopic eczema pathogenesis.[2],[3] The objective of this study was to identify antibiotic exposures during the prenatal period and infancy that influence the risk of atopic eczema in adolescence and young adulthood among participants in the Growing Up Today Study (GUTS), a cohort of people who are the offspring of female nurses in the Nurses' Health Study II (NHS2). All exposures were assessed retrospectively on the 2009 GUTS mothers' questionnaire.[5] Our primary outcome was the incidence of atopic eczema during adolescence and young adulthood. [Extracted from the article]