Test your diagnostic skills in our regular dermatology quiz. What is the cause of this mildly pruritic rash?
A 65-year-old man presents with mildly pruritic, erythematous plaques in a generalised distribution (Figure 1). He noticed the eruption on his distal arms, face and trunk three weeks ago, but it has recently started to involve his hands (Figure 2). He does not take any regular medications, and he denies any past history of eczema or psoriasis.