Which of the following is a sign of inflammation in skin conditions?

Redness is a classic sign of inflammation in skin conditions because it occurs due to an increase in blood flow to the area, which is part of the body's natural response to injury or irritation. When the skin is inflamed, the blood vessels dilate, leading to a reddish appearance. This process often accompanies other symptoms such as swelling, heat, and pain—further illustrating the body's effort to heal and address the underlying issue.

While dryness, itching, and flaking can be associated with various skin issues, they do not specifically indicate inflammation. Dryness can result from a lack of moisture, itching may stem from irritation or underlying conditions but is not an inflamed state, and flaking often relates to conditions like psoriasis or eczema without necessarily indicating inflammation. Redness is thus a key and primary indicator of inflammation, making it the correct choice in identifying skin conditions related to inflamed tissue.