An extremely itchy rash on the arms following yardwork

A 34-year-old man presents with an itchy rash, primarily on his arms, but also, to a lesser extent, on his face. He denies any fever or malaise, and his medical history is unremarkable. He does not take any medications and notes that he spent the previous weekend doing yardwork on his property, and the rash appeared 4 days later. Physical ...