senile purpura
A medical condition in which fragile blood vessels cause purplish bruises on the skin of elderly people, often on the arms and hands.
Senile purpura is a bruise often seen on the arms and backs of the hands of elderly people.
Compound of 老人 (roujin, 'elderly person') + 性 (sei, 'nature, characteristic') + 紫斑病 (shihanbyou, 'purpura'). A straightforward medical term describing the condition.