A 24-year-old woman presents with 2 weeks of pruritic rash on the dorsum of both hands and forearms after starting a new dishwashing job. She reports frequent exposure to detergents and repeated handwashing. Physical examination shows erythematous plaques with superficial, flaky white material that can be gently scraped off. No vesicles, pustules, or purulent drainage are noted. Which of the following best describes the secondary skin lesion seen in this patient?