MPO and eosinophilic granulomatosis with polyangiitis: The eosinophilic infiltrate observed in cutaneous biopsies is a critical diagnostic clue and often coexists with vasculitic features or granuloma formation [36], while ANCA antibodies, particularly those directed against myeloperoxidase (MPO p-ANCA), represent another important biochemical marker of EGPA, although not always present [37].