A 53-year-old man presents with a 5-year history of an itchy, scaly spot on his leg. He has treated it with over-the-counter creams and ointments, which temporarily relieved the itching and reduced the scaling, but the lesion has never gone away. He has no other personal or family history of skin conditions. His medical history includes type 2 diabetes and depression. On physical examination, a hyperpigmented lichenified patch with overlying white scale is seen on the left superior knee.
Can you diagnose the condition in Case 1?
B. Lichen planus
C. Contact dermatitis
D. Lichen simplex chronicus
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