What is the term for reddening of the skin?

The term for reddening of the skin is erythema. Erythema refers specifically to the redness that occurs when the blood vessels in the skin expand, a response often due to inflammation, irritation, or increased blood flow. This condition can be caused by various factors, including exposure to sunlight, allergic reactions, infections, or underlying health issues. Recognizing erythema is important in clinical settings as it can indicate different dermatological or systemic conditions.

Other terms in the choices represent different skin-related conditions. Dermatitis refers to inflammation of the skin, which may include erythema but is broader in scope. Induration describes a hardening or thickening of tissue, indicative of chronic inflammation or infection rather than redness. A vesicle is a small fluid-filled blister that can occur in various skin conditions but does not directly refer to the reddening of the skin. Understanding these distinctions is crucial in recognizing and diagnosing skin conditions effectively.