EGFR and paronychia: Given these patterns and the suspected role of microbial colonization—particularly with S. aureus—in the development and persistence of CARs, we conducted an observational, prospective investigation in the Oncology Departments of the Bucharest University Emergency Hospital, Elias University Emergency Hospital, and the Bucharest Oncology Institute, between May 2014 and January 2015, analyzing the phenotypic and genotypic characteristics of S. aureus strains isolated from papulopustular lesions and paronychia in patients undergoing EGFR inhibitor therapy.