Rights© 2019 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. This is the peer reviewed version of the following article: Zhang X and McElwee KJ (2020) Allergy promotes alopecia areata in a subset of patients. Experimental Dermatology. 29(3): 239-242, which has been published in final form at https://doi.org/10.1111/exd.14027. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.