What Causes Unexplained Bruises to Appear on Your Legs?

Bruising on the legs is not necessarily dangerous, but if you begin to notice bruises on the legs when you do not recall injuring yourself, then it can be a bit alarming. Since bruises often take a few days to appear, it can be easy to forget a minor incident that might have caused it. However, if these unexplained bruises begin to appear on the legs quite frequently, then there may be an underlying ailment that could be disrupting your circulation. This is especially concerning if your bruises take an especially long time to heal after they appear.

Causes of Unexplained Bruising on Legs

Causes are ranging from injuries to underlying diseases and lifestyle factors. Here shows the detailed information that causes excessive bruising.


The skin and tissue in the limbs become thinner and less flexible as the body ages. This makes it easier to cause a tear during a minor injury, leading to excessive bruising on the arms or legs.


If you recently experienced an injury on your leg such as a severe bruise, you may have done damage underneath the skin. Excessive exercise can also damage the tissue underneath the skin. As this tissue heals, you may be more susceptible to leaking blood near the tears in the blood vessels, leading to unexplained bruising.

Vitamin Deficiency

If the body lacks in the nutrients necessary to build tissue properly, the tissue can become worn and more susceptible to injury. Deficiencies in vitamin B12, C or K can lead to poorly formed tissue. Women are more likely to experience these deficiencies than men, especially when they are dieting. As the body loses the excess fat, the thin tissue becomes more exposed and easier to injure, leading to unexplained bruising on legs or other parts of body. 

Excessive Medication Use

Using medications that disrupt the circulation can increase your chance of bruising. Ibuprofens, anti-inflammatories, aspirin or some birth control medications can lead to blood thinning, which increases your risk of bleeding. This side effect should be listed on the prescription information.


Diabetes can disrupt the circulation, making it easier for your skin to bruise. You may also notice brown or black patches appearing in areas where the skin folds or creases. Hyper-pigmentation may also appear in areas where you inject your insulin. If you have not yet been diagnosed with diabetes, watch for blurred vision, excessive thirst, fatigue or difficulty fighting off infections in addition to increased bruising on the legs.

Graves' Disease

This is an autoimmune disease that damages the thyroid, causing it to produce an excessive amount of hormones. This overstimulates the thyroid gland, causing the body to burn calories more quickly than it should, leading to excessive weight loss. An overactive metabolism can cause the capillaries below the skin to become damaged, leading to red or unexplained bruising on legs and other areas. Side effects of this condition include rapid heartbeat, irritability, difficulty sleeping, light menstrual flow or physical weakness.


Cirrhosis of the liver is caused when healthy tissue is replaced with scar tissue. This scar tissue can develop due to injury or disease, and will disrupt proper protein production, digestion, immune system function and blood health. This can lead to a lack of energy, unexplained weight gain or excessive bruising. Those with this condition are also more susceptible to developing liver cancer.


Leukemia is a form of cancer which grows in the bone marrow, disrupting the production of red and white blood cells. As these tissues become damaged, you may begin to experience excessive bleeding from wounds or unexplained bruising on the limbs. You may also notice bone aches, red blotches on the skin, excessive perspiration or unexplained fever or chills.

How to Treat Bruising on Legs

When you notice unexplained bruising on legs, there are some tips that may be helpful for you to combat this condition. Apply the optimum one for yourself.

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