Summary Background The European League Against Rheumatism/American College of Rheumatology classification criteria for inflammatory myopathies are able to classify patients with skin‐predominant dermatomyositis (DM). However, approximately 25% of patients with skin‐predominant DM do not meet two of the three hallmark skin signs and fail to meet the criteria. Objectives To develop a set of skin‐focused classification criteria that will distinguish cutaneous DM from mimickers and allow a more inclusive definition of skin‐predominant disease. Methods An extensive literature review was done to generate items for the Delphi process. Items were grouped into categories of distribution, morphology, symptoms, antibodies, histology and contextual factors. Using REDCap™, participants rated these items in terms of appropriateness and distinguishing ability from mimickers. The relevance score ranged from 1 to 100, and the median score determined a rank‐ordered list. A prespecified median score cut‐off was decided by the steering committee and the participants. There was a pre‐Delphi and two rounds of actual Delphi. Results There were 50 participating dermatologists and rheumatologists from North America, South America, Europe and Asia. After a cut‐off score of 70 during the first round, 37 of the initial 54 items were retained and carried over to the next round. The cut‐off was raised to 80 during round two and a list of 25 items was generated. Conclusions This project is a key step in the development of prospectively validated classification criteria that will create a more inclusive population of patients with DM for clinical research. What's already known about this topic? Proper classification of patients with skin‐predominant dermatomyositis (DM) is indispensable in the appropriate conduct of clinical/translational research in the field. The only validated European League Against Rheumatism/American College of Rheumatology criteria for idiopathic inflammatory myopathies are able to classify skin‐predominant DM. However, a quarter of amyopathic patients still fail the criteria and does not meet the disease classification. What does this study add? A list of 25 potential criteria divided into categories of distribution, morphology, symptomatology, pathology and contextual factors has been generated after several rounds of consensus exercise among experts in the field of DM. This Delphi project is a prerequisite to the development of a validated classification criteria set for skin‐predominant DM.

We thank the patients who have graciously accepted to complete the surveys. Without their participation, this study would not have been possible.

Nonetheless, over half of this cohort found AA to be moderately or seriously financially burdensome, and the average out-of-pocket costs of $1354 is similar to the average out-ofpocket costs of $1418 for patients with psoriasis. 4 The reallife willingness to pay of this cohort reflects the consequences of AA on the everyday lives of patients. Although future work is required to confirm these results and determine their generalizability to the overall community of patients with AA, these findings suggest that the negative psychological consequences of AA may be compounded by financial distress, which has been shown to place patients at risk for worse quality of life. 5 As payers begin to explore coverage around an increasingly promising pipeline for AA treatments, we hope that this evaluation can encourage broader financial coverage for treatments of this psychologically and financially burdensome disease-not just for pharmaceuticals, but for supplementary therapies as well. Physicians should be aware of the potential ramifications of treatment costs for patients and consider financial impairment as an unintended consequence of their recommendations.