What condition describes an increased reaction of the skin to sunlight?

Photosensitivity is the condition that describes an increased reaction of the skin to sunlight. This heightened sensitivity can lead to adverse skin reactions such as rashes, redness, or even blistering when the skin is exposed to ultraviolet (UV) rays. Individuals with photosensitivity may experience these reactions more intensely than others, sometimes even after minimal sun exposure.

Dermatitis refers to inflammation of the skin that can have various causes, including irritants or allergens, but does not specifically denote an increased sensitivity to sunlight. Psoriasis is a chronic skin condition characterized by rapid skin cell production, resulting in thick, red patches covered with silvery scales; it is not primarily about sensitivity to sunlight. Erythema indicates redness of the skin caused by increased blood flow, which can occur due to various reasons, but it doesn’t specify the heightened reaction to sunlight that characterizes photosensitivity. Therefore, the focus on the increased reaction to sunlight in photosensitivity makes it the correct answer.