Final answer:
The area around an injury becomes hot, swollen, red, and painful due to inflammation.
Step-by-step explanation:
The area around an injury becomes hot, swollen, red, and painful due to inflammation. Inflammation is a localized response of the innate immune system that occurs to protect the body against infection and repair tissue damage. It is characterized by the movement of leukocytes and fluid through opened capillaries to the site of infection. The signs and symptoms of inflammation include redness, swelling, heat, and pain.