My mom is 70 she has 3 blood bumps one on each of her fore arm & one on the left shin they are raised & ball shaped don't cause her pain or sore?

Increased fragility. Skin and blood vessels in the skin become fragile with aging and blood vessels breakdown with very minor trauma. This results in bleeding under the skin and may be asymptomatic. See this site for more info. http://www.nlm.nih.gov/medlineplus/ency/article/004014.htm.