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Distant (a) and closer (b) frontal views of the anterior lower extremities of a 39-year-old Japanese woman with erythema nodosum developing after she received vaccination with Tdap vaccine. Tender, erythematous, individual (left leg) and grouped (right leg), nodules are present on the distal pretibial legs (a). Erythema nodosum appears as a large, 12 by 8 cm, nodule on the distal pretibial left leg (b)
