DermatomyositisPolymyositisMyositisParaneoplastic SyndromesLung Diseases, InterstitialMediastinal EmphysemaPanniculitisMuscle WeaknessHistidine-tRNA LigaseAutoantibodiesLupus Erythematosus, CutaneousPrednisoloneMuscle, SkeletalRheumatic DiseasesMyositis, Inclusion BodyImmunoglobulins, IntravenousImmunosuppressive AgentsConnective Tissue DiseasesBiopsySkinMicroscopic AngioscopyTelangiectasis