What type of lesions typically characterize contact dermatitis?

Contact dermatitis is characterized primarily by papular and vesicular lesions. These types of lesions are indicative of the skin's inflammatory response to allergens or irritants that come into contact with it.

Papular lesions are small, raised bumps on the skin, often accompanied by itching, while vesicular lesions are fluid-filled blisters that can develop when the skin reacts severely to an irritant or allergen. The appearance of these lesions can progress from localized redness and swelling to more pronounced blistering, depending on the severity of the exposure and the individual's sensitivity.

In contrast, while scaly and crusty lesions, blistering and dry skin, or red and flat skin may occur in a range of skin conditions or other types of dermatitis, they do not specifically define contact dermatitis. The hallmark of contact dermatitis lies in the combination of inflammation leading to papules and vesicles in response to direct contact with the offending agent. Understanding these characteristics aids in diagnosing the condition and determining appropriate treatments.