5 evenings ago I was in a serious impact car accident and was bruised on my abdomen and pelvic area. I am significantly overweight and older. I do not have internal pain or any gastrointestinal symptoms. Today the bruises in the pelvic region have merged. They are not hot or hard. I have been walking all week at work and carrying items. Will bruises get bigger and change for a while. A doctor checked them Tuesday and said they would resolve. Does activity increase the size?