Derm Dx: A red, scaly rash covering the entire body

A 45-year-old patient presents complaining of red and scaly rash covering her entire body. She reports the rashes that have come and gone during the past four months, but over the past week she has become completely red.

The patient is shivering slightly on exam, but otherwise appears nontoxic. Her trunk, extremities, and face are erythematous with a ...