A 24-year-old woman presented at 15-weeks gestation with a 1-week history of erythematous, tender lesions on the pretibial aspects of both legs. The patient reported having had a "flu-like" illness with fever, a sore throat and dry cough during the same time as these lesions developing. The "flu" symptoms resolved within 10 days without medical intervention, but the lesions on her legs persisted. An initial antistreptolysin-O titre was raised.What is the most likely diagnosis in this case?

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