Derm Dx: Dermatitis on the Torso of a Baseball Player

The patient is a 21-year-old college athlete who presents for evaluation of dermatitis affecting his chest and back. The eruption began approximately 3 weeks ago during baseball season and worsened while he was receiving therapy with doxycycline. Due to increased pruritus, oral prednisone was added to his treatment regimen 1 week ago. Examination revealed multiple erythematous papules and occasional pustules ...