New Eczematous Eruption in Patients With Inflammatory Bowel Disease Who Stop Janus Kinase Inhibitors.

Yanofsky, Russell; McDonald, Benjamin D; Nikzad, Newsha; Choi, David; Shea, Christopher R; Chadha, Angad A; Rubin, David T · Am J Gastroenterol · 2026

case_series · Level IV

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Abstract

Janus kinase inhibitors (JAKi) are small-molecule therapies used in inflammatory bowel disease (IBD). We describe 8 patients with IBD who developed an eczematous eruption, presumed atopic dermatitis (AD), after stopping JAKi therapy. This case series describes 8 patients with IBD who developed de novo AD after withdrawal of JAKi therapy. Median time to AD onset was 7 days (interquartile range 2-12). Two cases with biopsy-confirmed AD resolved after reinitiation of JAKi therapy and adjunct AD treatments. A subset of patients with IBD may have latent susceptibility to AD, unmasked by therapy cessation and potentially triggered by an immune rebound effect.

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