A 28-year-old woman presents with a 3-week history of an itc…

A 28-year-old woman presents with a 3-week history of an itchy, erythematous patch on her forearm that has gradually enlarged with central clearing. She reports frequent contact with shelter animals during volunteer work. Physical exam reveals a well-demarcated, scaly border. Based on the clinical presentation and exposure, which diagnosis is most likely?