Which condition is characterized by redness of the skin?

Erythema is the term used to describe the reddening of the skin, which occurs due to increased blood flow to the surface of the skin. This physiological response can be triggered by various factors, including inflammation, infection, or exposure to heat. Erythema may manifest as a sign of underlying conditions such as sunburn, allergic reactions, or skin irritations, indicating that the body is responding to an injury or irritation.

In contrast, edema refers to swelling caused by an accumulation of fluid in the tissues, eczema is a chronic inflammatory skin condition characterized by itchy, inflamed skin, and varicosity involves dilated, swollen veins usually in the legs. These terms describe conditions that differ fundamentally in their presentation and underlying mechanisms compared to erythema, making erythema the distinct choice that specifically denotes skin redness.