The back of the hands of the elderly are prone to purplish bruises, senile purpura is the most likely, but it is best to check the blood routine and coagulation function first to rule out subcutaneous bleeding caused by thrombocytopenia or abnormal coagulation function, such as abnormal liver function leading to abnormal coagulation function. If the above results are normal, consider senile purpura, senile purpura is caused by aging or prolonged exposure, sunlight and sunlight, resulting in thinning and relaxation of the skin, which makes the skin and subcutaneous tissue atrophy and lack of elasticity, reducing the protective role of blood vessels. A slight trauma can cause blood vessels to rupture and bleed, resulting in a bruised spot, which has no effect on health. It is important to avoid trauma, improve nutrition, avoid the use of glucocorticoids, and do not need excessive treatment, and vitamin C and vitamin E can be given orally.