“…2 Allergic hypersensitivity reactions account for less than 2% of all adverse drug reactions and are not fully understood. 6 However, it is known that different mechanisms play a role depending on the drug, and additional factors such as viral infection may also be involved. 7 While pembrolizumab could theoretically contribute to the CAEs, the distinctive clinical and histopathological findings in our patients -such as dyskeratosis, apoptotic keratinocytes, and a superficial perivascular infiltrate with sporadic eosinophils, 2-4 along with negative DIF, primarily supported the diagnosis of EV-induced toxicity.…”