Leathery Verrucous Plaques and Nodules

Plaques and nodules on his pretibial areas, the dorsal side of the patient's hands, dorsal side of his feet, and his left buttock
Plaques and nodules on his pretibial areas, the dorsal side of the patient’s hands, dorsal side of his feet, and his left buttock

A 61-year-old man presented with bilateral, asymptomatic, indurated non-pitting verrucous plaques and nodules on his extremities and buttocks. He was diagnosed with Graves’ disease 20 years ago.

What is the diagnosis ?