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Following this study, Munang and colleagues (2002) looked at bruises in children, and observers were asked to decribe the predominant colour in vivo, and then again at a later date from a colour photograph.Reliance on the colour yellow was thus beginning to be questioned, and Hughes et al (2004) showed subjects a series of photographs of bruises in which the yellow 'saturation' was digitally altered, in order to evaluate differences in yellow perception.Bruises located nearer to the surface appearing red, while those located deeper appeared blue (due to the optical characteristics of the skin and the 'Rayleigh scatter phenomenon' i.e.
They also indicated that the colours in bruises were dynamic, and could 'reappear' days later, and that separate bruises on the same person, inflicted at the same time did not necessarily exhibit the same colours, nor undergo equivalent changes in colours over time.
Taking just a few extra seconds to put on that gear might save you from a couple of weeks of aches and pains.
Traditionally, opinion regarding the 'age' of a bruise was based in large part on the colour of the bruise, and authors of forensic textbooks gave their own suggested 'timetable' of colour changes with time (summarised in Langlois and Gresham 1991).
If you keep standing, more blood will flow to your bruised shin and the bruise will be larger. Minor bruises are easily treated, but it's probably best to talk to a doctor if: Bruises are kind of hard to avoid completely.
But if you're playing sports, riding your bike, inline skating, or doing anything where you might bump, bang, crash, or smash into something, it's smart to wear protective gear like pads, shin guards, and helmets.