Muscle T cells from IBM patients differentiated from the others by a stronger expression of genes related with T‐cell tissue residency (ITGAE, XCL1, CXCR6, ZNF683), whereas in the patient with DM, muscle T cells presented an increased expression of CXCL13, HLA‐DRB5 and HLA‐DRB1 possibly reflecting the presence of peripheral helper T cells (Kobayashi et al, 2013; Rao et al, 2017; Argyriou et al, 2022). Here, HLA-DRB1 is linked to dermatomyositis.