This 49-year-old man was first diagnosed with Darier disease at age 8. It has been contained, for the most part, by topical medications and acitretin. But the itching on his legs is especially severe, making it difficult for him to leave them alone.
EXAMINATION
Both legs have heavy scaling and lichenification from the lateral aspects of the knees down to the ankles. There is modest erythema but no suppurative signs. Other areas of scaling are seen on his chest and back, but these are less coarse and rough than the leg rash.
What is the diagnosis?