A 28-year-old nurse has complaints of itching and a rash of both hands. Contact dermatitis is initially suspected. The diagnosis is confirmed if the rash appears（）
A. erythematous with raised papules.
B. dry and scaly with flaking skin.
C. inflamed with weeping and crusting lesions.
D. excoriated with multiple fissures.
参考答案：A
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.