How a bruise forms
A bruise forms when a blow breaks small blood vessels near the skin's surface, allowing a small amount of blood to leak out under the skin. The trapped blood appears as a black-and-blue mark — a bruise. Sometimes tiny red dots or red splotches appear. Your body reabsorbs the blood with time, which causes the bruise to change color and eventually disappear.
Generally, the harder the blow, the larger the bruise. However, if you bruise easily, a minor bump — one you may not even notice — can result in substantial discoloration.
As you age, it's not uncommon for bruises to appear for no apparent reason. Your arms and legs are typical locations for these bruises.
Sometimes medications are the cause
Older adults tend to take more medications than do younger adults. Certain medications may cause you to bruise easily. For example, aspirin can somewhat interfere with your blood's ability to clot, increasing your risk of bruising. Other medications, such as ibuprofen, can also cause bleeding and bruising. People who are on prolonged steroid therapy for rheumatoid arthritis or asthma also may bruise more easily. Steroids and cortisone drugs also may thin the skin.
The benefits of these drugs, however, far outweigh the side effect of easy bruising. So don't discontinue any medication you suspect is causing you to bruise easily unless you first talk to your doctor.
Know that certain dietary supplements, including fish oil, vitamin E, garlic, ginger and ginkgo, also may contribute to easy bruising by increasing your risk of bleeding, especially if you're taking a blood thinner. Tell you doctor about any supplements you're taking, particularly if you're also taking a blood thinner.
It could also be something as simple as low Iron. If you just bruise once in a while when you bang yourself somewhere, practically no need to run to the doctor but if it happens often you may consider checking it out. Good luck and watch your steps. HAHA ! !