eli5: why are areas where your skin was cut or scraped get hot later?

Question

eli5: why are areas where your skin was cut or scraped get hot later?

In: Biology

Answer 1

Those areas turn hot and red because blood is being directed to the site of the injury, both for clotting reasons (blood contains platelets which mediate clotting) and immune response reasons (blood also contains white blood cells, which mediate the immune response).