What Are Some Potential Causes of Blood Spots on the Arms?

Blood spots on the arms, a condition called purpura, may be the result of congenital disorders, weak blood vessels, a vitamin C deficiency, steroid use or inflamed blood vessels, according to Healthline. Other causes include bloodstream infections, disorders of the immune system, platelet inhibiting medications and blood transfusions.

Blood spots occur when blood vessels burst under the skin. Purpura is either nonthrombocytopenic, which indicates normal blood platelet counts, or thrombocytopenic, which indicates a lower than normal blood count, explains Healthline. Aspirin, blood thinners and sepsis cause blood spots. Bleeding or clotting disorders, such as lupus, cirrhosis and leukemia, and vitamin B12, K and folic acid deficiencies also cause blood spots, notes Norris Cotton Cancer Center.