Dear Editor, Data on various cutaneous adverse events as a result of widespread SARS-CoV-2 vaccination is currently accumulating. However, data on cutaneous reactions following booster dose of COVID-19 vaccines are still limited. 1,2 Herein, we present a case of pityriasis rubra pilaris (PRP) following a booster dose of the BNT163b2 (Pfizer-BioNTech) mRNA COVID-19 vaccine. An 85-years-old woman presented to our department with pruritic, erythematous lesions on her scalp, spreading to the trunk and palms, appearing one week after the injection of the booster dose of the Pfizer-BioNTech COVID-19 vaccine. By contrast, the patient reported only mild local tenderness after administration of the first and second dose of the Pfizer-BioNTech COVID-19 vaccine. The patient didn't reveal other possible triggers such as recent infections,changes in her medications, or exposure to UV light preceding the skin eruption. Her medical history was positive for chronic pancreatitis, arrhythmia, and arterial hypertension, and these conditions were well-controlled over a long period. She had no personal or family history of skin diseases. On physical examination, she presented with scaly orange to red plaques on her trunk and waxy yellow palmar keratoderma (Figure 1A-C). Her legs, soles, and nails were not affected