One of my knees keeps getting a noticeable bruise over the kneecap after impact exercise (circuits / running). It's a bit sore, but not horribly painful - e.g. I can walk on it easily (and pretty much forget about it) and can run through the discomfort. The pain is mainly towards the outside I'd the kneecap (not really over the top of the kneecap). If I don't exercise the bruise goes away, but then comes back when I do. I would quite like to self diagnose and treat this as live somewhere where getting to a doctor is a nuisance and I'm not sure there really are any decent physios (developing world). Any ideas? I'll also post in exercise.