What is a common symptom of a skin allergy?

A common symptom of a skin allergy is redness and irritation. Allergic reactions occur when the immune system reacts to a substance it identifies as a threat, which can lead to inflammation and increased blood flow to the affected area. This response often results in visible symptoms such as redness, swelling, and irritation in the skin. These symptoms indicate that the skin is reacting to an allergen, which can be anything from a topical product to an environmental irritant.

The other options, such as increased elasticity, tighter skin texture, and a smooth and clear complexion, do not align with the expected physical responses to an allergic reaction. Increased elasticity and tight textures may imply healthy skin, while smooth and clear complexions suggest skin that is free from irritation or allergic reactions. Thus, the characteristic symptoms of a skin allergy distinctly include redness and irritation, making this option the most accurate representation of the condition.