Clinical introduction

A 27-year-old woman presented with persisting painful leg lesions despite 14 days of antibiotic therapy with amoxicillin clavulanate prescribed for presumptive bilateral leg cellulitis. There was no fever or other systemic symptoms. Her medical history was unremarkable and her only medication was a contraceptive pill she had been taking for 3 months. Physical examination showed painful, warm and erythematous plaques with confluent palpable nodules on both lower limbs (figure 1 …