A bruise, medically known as an ecchymosis, develops when small blood vessels beneath the skin are damaged and blood leaks into nearby tissues.
This can happen after a noticeable impact, such as hitting your leg against a table. But it can also happen after a very minor bump that you barely notice.
As the leaked blood accumulates beneath the skin, it creates a visible mark. The color may initially appear red or purple, then gradually change to blue, green, yellow, or brown as the body breaks down and reabsorbs the blood.
The color changes are part of the normal healing process.
Some people bruise more easily than others because their skin and blood vessels are more fragile, their platelet function is different, or their blood does not clot as efficiently.
This is particularly common among older adults, whose skin becomes thinner and whose protective layer of fat beneath the skin may decrease.
Therefore, finding a bruise without remembering an injury does not automatically mean that something serious is happening.
However, repeated bruising without an obvious explanation deserves attention, especially when it represents a new change.
2. Aging Can Make Your Skin More Vulnerable to Bruising
One of the most common reasons older adults develop bruises more easily is a natural change in skin structure.
As people age, their skin gradually becomes thinner and loses some of its collagen and elasticity. The small blood vessels beneath the skin may also become more fragile.
In addition, the protective fatty layer under the skin can become thinner, leaving blood vessels less protected from everyday bumps.
This can lead to a condition called actinic purpura, also known as senile purpura.
It commonly appears as flat, purple or reddish patches on the backs of the hands and forearms. These marks may appear after relatively minor contact and can take several weeks to fade.
Although the appearance can be alarming, actinic purpura is generally related to skin and blood vessel fragility rather than a serious clotting disorder.
People who have spent considerable time in the sun may be more susceptible because long-term ultraviolet exposure contributes to skin damage.
Protecting the skin from excessive sun exposure, using moisturizers, and reducing accidental bumps may help limit further damage.
Nevertheless, new or widespread bruising should not automatically be attributed to aging. A healthcare professional can help distinguish age-related skin changes from other causes.
3. Medications May Be Making You Bruise More Easily
Medication is an important and sometimes overlooked cause of unexplained bruising.
Certain medicines affect platelets, interfere with blood clotting, or make blood vessels and skin more vulnerable to bleeding.
Examples include:
Anticoagulants: Medicines such as warfarin, apixaban, rivaroxaban, and dabigatran reduce the blood's ability to form clots. They are commonly prescribed to prevent or treat dangerous blood clots.
Antiplatelet medications: Aspirin and clopidogrel affect platelet activity, making it harder for platelets to form an initial plug at the site of a damaged blood vessel.
Nonsteroidal anti-inflammatory drugs (NSAIDs): Medicines such as ibuprofen and naproxen may affect platelet function and increase bleeding risk in some people.
Corticosteroids: Long-term use of oral or topical corticosteroids can thin the skin and make blood vessels more fragile.
Some supplements may also influence bleeding risk, particularly when combined with prescribed medication. Examples include high-dose fish oil, ginkgo, and certain herbal products.
If bruises begin appearing after starting a new medicine or changing a dose, tell your doctor or pharmacist.
One important warning: never stop a prescribed blood thinner or antiplatelet medicine on your own because of bruising. Suddenly stopping these medicines can increase the risk of serious complications, including stroke or blood clots.
Instead, seek medical advice about whether your treatment needs to be reviewed.
4. Vitamin Deficiencies Can Affect Blood Vessels and Clotting
Nutrition plays an important role in maintaining healthy blood vessels and normal blood clotting.
Some vitamin deficiencies can contribute to unusual bruising.
Vitamin C deficiency
Vitamin C is essential for collagen production. Collagen helps maintain the structure and strength of skin, connective tissue, and blood vessel walls.
Severe vitamin C deficiency can cause scurvy, a condition associated with fragile blood vessels, bruising, bleeding gums, poor wound healing, and fatigue.
People with very restricted diets, severe food insecurity, certain digestive conditions, or problems with nutrient absorption may be at increased risk.
Vitamin K deficiency
Vitamin K is necessary for the production of several proteins involved in normal blood clotting.
A significant deficiency can interfere with clot formation and contribute to excessive bleeding or bruising.