Which of these is a sign that could indicate inflammation?

Inflammation is a complex biological response to harmful stimuli, such as pathogens, damaged cells, or irritants. One of the classic signs of inflammation is heat, which occurs due to increased blood flow to the affected area. This increased circulation brings with it immune cells and nutrients necessary for healing, resulting in the area feeling warmer than the surrounding tissue. This heat is a direct result of the body's efforts to combat the source of inflammation and promote healing.

In contrast, pallor, increased mobility, and decreased pain do not directly indicate inflammation. Pallor may suggest a lack of blood flow or a different issue altogether, while increased mobility may imply that the area is functioning normally rather than being inflamed. Decreased pain can occur after inflammation has subsided, but it is not a sign of active inflammation. Hence, heat stands out as a key indicator of an inflammatory process.