Which skin condition involves the dilation of blood vessels leading to noticeable redness?

Rosacea is a chronic skin condition characterized primarily by facial redness and visible blood vessels. The dilation of blood vessels, or erythema, is a hallmark of this disorder, which often leads to a flushed appearance, especially on the central face, including the cheeks, nose, and forehead. This condition may also present with swelling, papules, and pustules, but it is the dilation of these blood vessels that primarily causes the noticeable redness associated with rosacea.

Eczema, psoriasis, and dermatitis do involve skin inflammation, but they are distinguished by different symptoms and underlying causes. Eczema is often characterized by itchy, inflamed patches that can become dry and scaly. Psoriasis is an autoimmune condition that results in thick, red patches covered with silver scales. Dermatitis, which encompasses various inflammatory skin conditions, also does not typically focus on the persistent redness caused by blood vessel dilation as rosacea does. Thus, rosacea is the skin condition specifically associated with noticeable redness due to blood vessel dilation.