Is there a lump under the bruise? My bruise went frompurple to yellow.
Dear bubbles22: A bruise (or hematoma) is caused by bleeding under the skin. The most common cause of bruising is trauma (either bumping it or surgery etc). It is not uncommon to have a bruise form and not remember the trauma. It is common for a bruise to change colors during the process of healing. Yellow to purple. If this does not improve over the next week you could check with your doctor.