Our bodies are home to a mix of good and bad live bacteria. They live in the mouth, gut and on the skin. The good ones known as Probiotics work in the intestine to improve digestion and increase absorption of nutrients and everywhere else they protect us against hostile bacteria that cause infection. 

Acute injuries create a predictable inflammatory response: redness and heat from an immediate increase in blood flow, nerve compression which causes pain and an increase of white blood cells which causes the swelling.