【正确答案】 A

【答案解析】Contact dermatitis is caused by exposure to a physical or chemical allergen, such as cleaning products, skin care products, and latex gloves. Initial symptoms of itching, erythema, and raised papules occur at the site of exposure and can begin within 1 hour of exposure. Allergic reactions tend to be red and not scaly or flaky. Weeping, crusting lesions are also uncommon unless the reaction is quite severe or has been present for a long time. Excoriation is more common in skin disorders associated with a moist environment.