Rare systemic skin hyperpigmentation associated with osimertinib: A case report.

A patient with advanced small cell lung cancer presented with systemic skin pigmentation, a rare and severe skin adverse reaction during treatment with osimertinib. Osimertinib-induced hyperpigmentation is rarely reported, According to the patient's condition, adverse drug reactions, and drug efficacy, osimertinib was the urgently needed treatment regimen, and 80 mg of osimertinib was continued. Therefore, we hope this case can provide experience for clinicians to identify adverse reactions of the drug and ensure the safety of patients.