Rashes, diarrhea, and neuropsychiatric issues


A man, aged 42 years, presents with a 6-month history of a painful, scaly skin rash. The eruption is symmetrically distributed over photosensitive areas, affecting his face, neck, upper back, forearms, and hands. The dorsal surfaces of his hands and forearms exhibit a dusky brown coloration over rough and cracked skin. He complains of itching and burning and reports intermittent ...