Is pityriasis rosea harmful to a person who is pregnant?

No.: There is no effect on baby but it would limit treatment.

Pityriasis Rosacea: Reports demonstrates a high risk for fetal loss and for neonatal weakness and hypotonia in pregnancies affected by pr during the early weeks of gestation. Clinicians should alert women who develop pr in pregnancy about the potential risks of this presumed viral infection, although there is no known effective intervention to prevent these complications. Nor is there a clear way to avoid pr.