Rights© 2020 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd. This is the peer reviewed version of the following article: McElwee KJ and Tosti A (2020) New developments in hair research. Experimental Dermatology. 29(3): 204-207, which has been published in final form at https://doi.org/10.1111/exd.14078. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.