Whenever I go for a long run or put extensive stress on my feet I end up bruising on the bottom side of my feet. The bruises are incredibly painful but only last a day. They occur near the ball of my foot or near the toes as well. I get the same sort of bruising after spending time in the pool (in areas where I can touch the bottom with my feet).
On my own research I found Metatarsalgia to be the closest related inflammation that matches my symptoms. My question is, what causes this bruising and what can be done to avoid it while remaining active?
Update: It seems like any high-impact activity can cause the bruising. I have minor bruises after playing basketball.
Update 2: I spoke with a foot doctor in the past and his diagnosis was that there was a higher load of stress on the bottom of the foot from activity. His remedy was stretching my legs out before activity to allow the proper support.