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Targeted BRAF inhibition with vemurafenib and dabrafenib has dramatically improved the survival rate in metastatic melanoma. These agents are now being tested for their efficacy against other tumors with BRAF mutations, including lung adenocarcinoma. While cutaneous adverse events are prevalent with BRAF inhibition, our patient, to our knowledge, is the first to develop a psoriatic eruption with BRAF inhibitors. We postulate that the elevation of tumor necrosis factor-alpha (TNF-α) and the paradoxical activation of the mitogen-activated protein kinase (MAPK) pathway due to BRAF inhibition may be responsible for the eruption. More studies are needed to further elucidate the immunopathogenic mechanisms behind this adverse event. The response to MEK inhibitors and/or increased TNF-α inhibition may help support or debunk our hypothesis.

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