A 29-year-old man presented to the dermatology clinic with a pruritic, erythematous, and scaly rash that had first appeared 2 years earlier. He had sought no medical treatment until this presentation. His medical history included eczema during childhood and seasonal allergies.
Physical examination showed erythematous, violaceous plaques that involved more than 90% of the patient’s body-surface area, with some areas that were spared and reflect the baseline appearance of the patient’s skin.
What is the diagnosis?
