Is this psoriasis or something more sinister?

An 82-year-old Caucasian woman presents with a six-month history of erythematous pruritic patches and scaly plaques over her legs.

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Professor Dedee Murrell is head of dermatology at St George Hospital and conjoint professor at the University of NSW.

This article was co-authored by Dr Timothy Cowan, a dermatology registrar at St George Hospital.