MSFinals-0821

A 36-year-old patient presented to the general practitioner with a complaint of a pale, velvety, hypopigmented patch on his chest and shoulder that he has been experiencing for the past few months. He reports no pain, itching, or scaling on the lesion. The patient has a medical history of rheumatoid arthritis and is currently taking methotrexate. Upon examination, scraping revealed scaling.
What is the most probable diagnosis for this patient?