What are common causes of contact dermatitis?

Common causes of contact dermatitis stem primarily from irritants or allergens that interact with the skin. This condition arises when the skin reacts to substances it comes into contact with, leading to inflammation. Irritants might include everyday materials such as soaps, detergents, or certain chemicals that cause a direct reaction, while allergens can be substances like nickel, fragrances, or certain plants such as poison ivy. These reactions can lead to symptoms including redness, itching, and swelling.

The other options describe factors that may not directly lead to contact dermatitis. For instance, infections or injuries pertain more to specific skin issues rather than the allergic or irritant responses characteristic of contact dermatitis. Genetic predispositions can influence skin sensitivity and overall skin health but are not direct causes. Similarly, changes in environmental temperature can affect skin but are not recognized as a direct cause of contact dermatitis. Understanding the distinction of these triggers is essential for effective prevention and management of the condition.