Which skin condition is marked by redness and visible blood vessels?

The condition characterized by redness and visible blood vessels is rosacea. This skin condition primarily affects the face and is often accompanied by flushing, persistent redness, and the presence of small, dilated blood vessels, known as telangiectasia. Individuals with rosacea may also experience papules or pustules, making the skin appear inflamed and sensitive.

Unlike eczema, which typically presents as dry, itchy patches, and psoriasis, which shows up as silvery scaling plaques, rosacea is specifically identified by its vascular features. Dermatitis, while it can also cause redness, generally presents with more varied symptoms including scaling, oozing, and significant itching, rather than the persistent flushing and visible blood vessels that define rosacea. Therefore, the unique combination of redness and telangiectasia in rosacea makes it the correct answer.