Fracture of the basal portion of the skull causes mastoid bruising.
same thing that causes bruising everywhere. crushed blood cells.
The bluish discoloration of the mastoid process is likely due to bruising or hematoma formation, which can occur following trauma to the area. It is important to monitor for any signs of infection or worsening symptoms, and seek medical attention if there is increasing pain, redness, or discharge.
damage to blood vessel
I doubt very much if pulling your hamstring causes bruising, because bruising is bleeding under your skin, so if it's bruised you should get that checked.
Infections in the middle ear can sometimes spread through the mastoid bone.
No. Bruising is usually a result of a heavy hit which causes underlying blood vessels to rupture. Cancer is caused by a 'mutation' in a persons genes
Period (mensturation) Cancer Overstimulation Bruising
Low iron or swollen veins
The muscle is from your clavical to your skull. The insertion of the muscle it's attachment to the skull.
Ice, as it causes bruising to go down.
Lots of things: Kicking
Lady's breast can, knees/ legs, and your nose do. Hope this helped, Morgan