Keywords: ANEM, Acute necrotizing eosinophilic myocarditis; CCL, C-C motif chemokine ligand; DIHS; DIHS, drug induced hypersensitivity syndrome; DRESS; IL, interleukin; JAK inhibitor; JAK, Janus kinase; Janus kinase; LVEF, left ventricular ejection fraction; RegiSCAR, Registry of Severe Cutaneous Adverse drug Reactions; STAT, signal transducer and activator of transcription; acute necrotizing eosinophilic myocarditits; drug reaction with eosinophilia and systemic symptoms; drug-induced hypersensitivity syndrome; tofacitinib.