I bruise very easily and after getting the slightest knock approx. 12 hours later the site will swell and become inflamed and very painful. Gradually it will disappear within about a week to 10 days. What is the cause of this?
I think you should see your GP and have this problem evaluated properly. Some people tend to bruise very easily and have always done so. You do not say if this problem is long term or of recent origin. This would be very relevant since if it were of recent origin it would suggest that some element within the clotting process is not functioning properly. There are many different reasons why this could be. An alternative possibility is that the tiny capillaries in the skin may be abnormally fragile. A blood test would enable your GP to detect if there is a problem with blood clotting.