Broken blood vessels in the hand are typically a result of an injury that jars the blood vessels, causing bleeding into the skin, according to Healthline. Infections of the blood, an allergic reaction, autoimmune disorders and the normal process of aging may also cause broken blood vessels.
Side effects from medication, chemotherapy and radiation may also cause blood vessels to break within the hand, explains Healthline. In some cases, certain diseases and infections can cause blood vessels to break, which in turn causes bleeding into the skin. For example, cancer of the blood cells, known as leukemia, may cause broken blood vessels and meningitis, an inflammation of the membranes covering the spinal cord and brain. In some cases, strep throat or whole body inflammation as a result of a bacterial infection may also cause broken blood vessels.
When blood vessels break in the hand, it is necessary to consult with a physician to determine the best treatment or to identify the specific cause, notes Healthline. If a patient has a medical condition or infection, physicians may prescribe medication to treat the infection or stop the bleeding. Current medications the patient is taking may prolong the bleeding once a blood vessel breaks, and a physician may have the patient temporarily stop the medication or switch to another prescription until the blood vessels heal.