Rights© 2019 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. This is the peer reviewed version of the following article: Kang H, Wu W-Y, Yu M et al (2020) Increased expression of TLR7 and TLR9 in alopecia areata. Experimental Dermatology. 29(3): 254-258, which has been published in final form at https://doi.org/10.1111/exd.14043. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.