Conflicts of interest: T.F.M. is a subinvestigator for Avita Medical, Clinuvel, Pfizer, Incyte, the National Institute for Allergy and Immunology, Ferndale Laboratories, Estée Lauder, Johnson & Johnson and Allergan, and has received honoraria as an advisory board member for Ferndale Laboratories. R.H.H. is an investigator for Pfizer, Incyte, Arcutis, Clinuvel and the Immune Tolerance Network. L.S.D., T.L. and F.Z. are employees of Pfizer, Inc, and hold shares in Pfizer, Inc. H.W.L. is an investigator for Incyte, La Roche-Posay, Pfizer and The Patient-Centered Outcomes Research Institute, and is also a consultant for Pierre Fabre, ISDIN, La Roche-Posay, Ferndale and Beiersdorf (previously known as Bayer). H.W.L. has served as a speaker for educational sessions for La Roche-Posay, Cantabria Labs, Pierre Fabre, Bioderma and Uriage. I.H. is a consultant for AbbVie, Pfizer, Incyte, UCB, Boehringer Ingelheim, Sonoma, Union Therapeutics, Novartis, Janssen, Avita, Galderma, Vimela, Almirall and Sonoma. I.H. is an Investigator for Lenicura, Pfizer, Incyte, Avita, L'Oréal/La Roche-Posay and the Immune Tolerance Network. I.H. is also a board member and past president of the Global Vitiligo Foundation. I.K. has served as an investigator for Ferndale, Estée Lauder, La Roche-Posay Dermatologique, Unigen, Johnson & Johnson, Allergan, Pfizer and Bayer; has received support from the American Skin Association for a vitiligo project; has served as a consultant for Pfizer, Johnson & Johnson, Beiersdorf and ISDIN; and has received salary support from the Dermatology Foundation through a research career development award.