A 70-year-old man with no PMH presents to a clinic with a rash on his hands and feet. He states that the rash began

A 70-year-old man with no PMH presents to a clinic with a rash on his hands and feet. He states that the rash began a few months ago and consisted of purple plaques found on his hands and ankles. He states that the rashes are occasionally itchy but are not painful at all. He is worried because the rashes come and go and continue to remain localized to his hands and feet after two months. He also had a whitish lesion in his mouth, but that has since resolved. He denies any systemic symptoms. Currently, the patient’s temperature = 98.5°F, HR = 80, RR = 18, and BP = 110/70. Physical exam reveals the rash shown below on his hands. What is the most likely diagnosis?A. Psoriasis. Pityriasis rosea. Contact dermatitis. Lichen planus