Bruises change in appearance over time, and it is possible to tell by looking at a bruise how old it is.
When it first appears, a bruise will be reddish looking. By one to two days, the reddish iron
from the blood undergoes a change and the bruise will appear blue or purple. By day six, the color changes to green and by day eight to nine, the bruise will appear yellowish-brown. In last 2-3 wks.