Patient with Thickening of the Scalp Skin with Ridges and Furrows

A 37-year-old man presented with a 4-year history of excessive sweating, headaches, and joint pain. His wife had also noticed increasing skin folds on his scalp. He also had enlarged feet and hands and a protruding lower jaw.

Patient with Thickening of the Scalp Skin with Ridges and Furrows

What is the most likely diagnosis?