Contact dermatitis is primarily caused by what?

Contact dermatitis is primarily caused by an allergic reaction or irritation. This condition occurs when the skin encounters a substance that triggers a negative response, leading to inflammation, redness, and discomfort. Common allergens include substances like nickel, fragrances, and certain plants like poison ivy, while irritants may include harsh soaps or chemicals.

This condition can manifest in two forms: allergic contact dermatitis, which results from an immune response to a specific substance, and irritant contact dermatitis, caused by direct damage to the skin. Understanding this distinction is crucial for proper identification and treatment.

The other options, such as inherited skin diseases, viral infections, or genetic predispositions, do not primarily relate to the mechanisms behind contact dermatitis. While they can affect overall skin health or predispose individuals to various skin conditions, they do not directly cause contact dermatitis in the same manner that allergens and irritants do.