Asymptomatic, Widespread, Erythematous-to-Violaceous Papules and Plaques

Asymptomatic, widespread, erythematous-to-violaceous papules and plaques

A 64-year-old man presented with a two-year history of this asymptomatic skin condition, which was symmetrically distributed over his trunk, arms and legs. Laboratory tests demonstrated a raised fasting blood glucose level.

What is the most likely diagnosis?