A Review of Pityriasis Rosea in Relation to SARS-CoV-2/COVID-19 Infection and Vaccination

Pityriasis rosea (PR) is an acute exanthematous disease, commonly preceded by a primary solitary herald patch followed by the onset of smaller scaly papulosquamous lesions within days to weeks. The exact cause of PR remains unclear; however, rash eruptions are thought to be associated with systemic reactivation of human herpesvirus 6 and 7 (HHV-6/7). Several cutaneous manifestations, including PR, have been reported secondary to SARS-CoV-2 infection and/or COVID-19 vaccination. The purpose of this review is to synthesize available data regarding PR in close association with SARS-CoV-2/COVID-19 infection and/or vaccination. A total of 154 patients were included in this study with 62 females and 50 males. PR was reported to occur more commonly in association with SARS-CoV-2/COVID-19 vaccination (102, 66.2%) than during infection (22, 42.3%) or post-infection (30, 57.7%). Interestingly, only 7.1% of patients were tested for concomitant HHV-6/7 past or current infection, with 4.2% testing positive or reporting a history of roseola infantum. While rare, clinicians should be aware of the possibility of patients developing PR associated with SARS-CoV-2/COVID-19 infection and/or vaccination, among other cutaneous reactions. Future studies exploring the link between PR and SARS-CoV-2/COVID-19 infection and/or vaccination would be beneficial, including direct examination of tissue and serological studies for evidence of COVID-19-induced HHV‐6/7 reactivation.