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Background: Acetaminophen (APAP) has been associated with the development of atopic diseases. However, little is known about the relationship between prenatal APAP exposure and atopic dermatitis (AD) in offspring. Objective: To investigate the association between prenatal APAP exposure and AD risk in offspring. Methods: In this study, 2029 study pairs (AD‐affected children and their mothers) and 5,058 control pairs were identified between 1998 and 2008 from the Taiwan Longitudinal Health Insurance Database. Maternal APAP exposure during pregnancy was assessed. Results: After adjustment for potential confounders, there was a significant association between risk of offspring AD and exposure to acetaminophen in the first trimester (OR 1.16; 95% CI 1.05‐1.28), the second trimester (OR 1.14; 95% CI 1.03‐1.27), both first and second trimesters (OR 1.30; 95% CI 1.13‐1.51), both first and third trimester (OR 1.20; 95% CI 1.04‐1.39), any trimester (OR 1.12; 95% CI 1.00‐1.26), and all three trimesters (OR 1.32; 95% CI 1.08‐1.62) in a dose‐response manner. Conclusions: Prenatal exposure to acetaminophen was associated with an increased incidence of offspring AD. [ABSTRACT FROM AUTHOR]

Background Atopic dermatitis affects 15-30% of children worldwide. Onset of disease usually occurs within the first year of life, over half of which regress by 6 years of age. The aim of this study was to investigate the risk factors related to the persistence of infantile atopic dermatitis. Methods In this birth cohort study, patients were enrolled prenatally and followed until 6 years of age; 246 patients had infantile atopic dermatitis at 6 months of age. Family history, maternal and paternal total and specific Immunoglobulin E (IgE) levels, and cord blood IgE were recorded. Clinical examination, questionnaire survey, and blood samples for total and specific IgE of the children were collected at each follow-up visit. Results Of the 246 patients with infantile atopic dermatitis at 6 months of age, 48 patients had persisted atopic dermatitis at 6 years of age (19.5%). Risk factors associated with persistent infantile atopic dermatitis included egg white sensitization (odds ratio: 3.801, P = 0.020), and atopic dermatitis involving two or more areas at 6 months old (odds ratio: 2.921, P = 0.018) after multivariate analysis with logistic regression. Patients with persistent infantile atopic dermatitis had a higher risk of asthma before 6 years old (39.6% vs 24.2%, P = 0.032). Conclusion Egg white sensitization and the initial involvement of two or more areas at 6 months of age were associated with the persistent infantile atopic dermatitis. Patients with persistent infantile atopic dermatitis are more likely to develop asthma by 6 years of age. [ABSTRACT FROM AUTHOR]