CD4 and dermatomyositis: Also, double positive (CD4 + CD8+) (DP) cell ratio and B lymphocyte ratio were reduced than in the Non‐PH‐DM (p = 0.048 and 0.034, respectively), while natural killer (NK) cell ratio and NK cell counts were significantly elevated than in the Non‐PH‐DM (p = 0.013 and 0.030, respectively).