What are common signs of contact dermatitis?

The signs of contact dermatitis are primarily characterized by an inflammatory reaction of the skin that arises following exposure to allergens or irritants. The symptoms include redness, itching, and swelling, which are all indicative of an inflammatory process. These reactions occur because the skin's barrier is compromised, leading to increased blood flow to the area and activation of the immune system.

Redness results from vasodilation as blood vessels expand to accommodate the immune response, while itching is a direct sensation related to the activation of nerve endings in the affected area. Swelling occurs due to the leakage of fluid into surrounding tissues as part of the inflammatory response. Together, these signs are crucial for identifying contact dermatitis and differentiating it from other skin conditions, ensuring proper treatment and management are administered.

While other options mention symptoms such as dryness and flaking, which can occur in various skin conditions, they do not fully encapsulate the primary response associated with contact dermatitis as accurately as the combination of redness, itching, and swelling. Thus, this option represents the classic presentation that practitioners should be aware of to recognize and address contact dermatitis effectively.