Low-grade fever, erythematous rash in pregnant woman · Dx?

Published Date
The Journal of Family Practice
J Fam Pract . 2017 Aug;66(8):E9-E10
O'Brien, J.M
Baum, J.D

A 31-year-old woman presented to her obstetrician's office at 16 weeks' gestation with a 2-day history of low-grade fever and an erythematous rash measuring 1 x 4 cm on her right groin. She had a medical history of a penicillin allergy (urticarial) and her outdoor activities included gardening and picnicking. What's your diagnosis?