The differentiating effect of COVID-19-associated stress on the morbidity of blood donors with symptoms of hidradenitis suppurativa, hyperhidrosis, or psoriasis.

"Declarations Competing interestMAS Henning reports grants from Leo Foundation (Grant number LF-18002), during the conduct of the study. M Didriksen, SR Ostrowski, C Erikstrup, K Nielsen, SG Sækmose, TF Hansen, H Ullum, LW Thørner, KA Kaspersen and S Mikkelsen report no conflict of interest. KS Ibler reports personal fees from Leo Pharma, Sanofi Genzymes, Astra Zeneca, and Eli Lilly. GBE Jemec reports grants and personal fees from Abbvie, grants from Leo Foundation, personal fees from Coloplast, personal fees from Chemocentryx, personal fees from LEO pharma, grants from Afyx, personal fees from Incyte, grants and personal fees from InflaRx, grants from Janssen-Cilag, grants and personal fees from Novartis, grants and personal fees from UCB, grants from CSL Behring, grants from Regeneron, grants from Sanofi, personal fees from Kymera, and personal fees from VielaBio, outside the submitted work. OB Pedersen reports a grant from the Leo Foundation received in 2019 together with G Jemec. Payments were made to the Department of Dermatology, Zealand University Hospital and Grant received in 2020 from the Independent Research Council Denmark to my department of Clinical Immunology, Zealand University Hospital. Ethical approvalAll procedures were in accordance with the Helsinki Declaration. The study was approved by the Regional Health Research Ethics Committees in Central Denmark Region and Zealand Region (M-20090237 and SJ-740, respectively). The Danish Data Protection Agency approved the study (general approval number P-2019-99). Consent to participateAll participants provided written informed consent before study participation. Consent to publishAll participants provided written informed consent before study participation. Competing interest MAS Henning reports grants from Leo Foundation (Grant number LF-18002), during the conduct of the study. M Didriksen, SR Ostrowski, C Erikstrup, K Nielsen, SG Sækmose, TF Hansen, H Ullum, LW Thørner, KA Kaspersen and S Mikkelsen report no conflict of interest. KS Ibler reports personal fees from Leo Pharma, Sanofi Genzymes, Astra Zeneca, and Eli Lilly. GBE Jemec reports grants and personal fees from Abbvie, grants from Leo Foundation, personal fees from Coloplast, personal fees from Chemocentryx, personal fees from LEO pharma, grants from Afyx, personal fees from Incyte, grants and personal fees from InflaRx, grants from Janssen-Cilag, grants and personal fees from Novartis, grants and personal fees from UCB, grants from CSL Behring, grants from Regeneron, grants from Sanofi, personal fees from Kymera, and personal fees from VielaBio, outside the submitted work. OB Pedersen reports a grant from the Leo Foundation received in 2019 together with G Jemec. Payments were made to the Department of Dermatology, Zealand University Hospital and Grant received in 2020 from the Independent Research Council Denmark to my department of Clinical Immunology, Zealand University Hospital."

"Funding Mattias Henning was provided a grant for research (Grant Number LF-18002) by the Leo Foundation Denmark. The COVID-19 survey used in DBDS was funded by the Danish Independent Research Council (0214-00127B). DBDS was further funded by the Novo Nordisk Foundation (Challenge Program—Big Data in Biomedicine NNF17OC0027594)."