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You notice a bruise.
It is small, purple, and painless. You do not remember bumping into anything, so you shrug it off and assume it is part of aging or everyday clumsiness.
In many cases, an occasional bruise is harmless. Bruises commonly appear after minor injuries that people do not remember, especially on the arms and legs.
However, bruising that is new, frequent, widespread, unusually large, or difficult to explain may deserve medical attention, particularly when it appears together with bleeding, fatigue, fever, swelling, weight loss, or other changes.
Unexplained bruising does not automatically mean that something serious is wrong. Still, it can occasionally be linked to medication effects, vitamin deficiencies, problems with blood clotting, liver disease, circulation problems, or other medical conditions.
How Bruises Form
A bruise develops when small blood vessels beneath the skin break and release blood into the surrounding tissue.
The trapped blood may first appear red, purple, blue, or nearly black. As the body gradually reabsorbs it, the bruise may turn green, yellow, or brown before disappearing.
Most ordinary bruises improve within approximately two weeks, although larger bruises can take longer.
Common Reasons for Bruising
Many everyday factors can make bruises more likely.
- Minor bumps or pressure that went unnoticed
- Thinner skin associated with aging
- Loss of protective fat beneath the skin
- Frequent physical activity or exercise
- Sun-related skin damage
- Certain medicines or supplements
- Recent blood tests, injections, or medical procedures
Why Bruising Becomes More Common With Age
As people age, the skin often becomes thinner and loses some of the fatty layer that cushions blood vessels.
Blood vessels may also become more fragile, so a minor impact can produce a visible bruise more easily than it did in earlier years.
Age-related bruises are often seen on the forearms and hands. Even so, a sudden major increase in bruising should not automatically be blamed on aging.
Medicines That May Increase Bruising
Some medicines affect blood clotting, platelet function, or skin strength and may make bruising more noticeable.
Examples can include:
- Anticoagulants, often called blood thinners
- Antiplatelet medicines
- Aspirin
- Some anti-inflammatory medicines
- Corticosteroids
- Certain antibiotics or other prescription medicines
Some supplements may also affect bleeding risk, especially when combined with prescription medicines.
Do not stop any prescribed medicine without speaking with the clinician who recommended it. A medical professional can decide whether the dose, combination, or treatment needs review.
When Bruising May Need More Attention
Bruising is more concerning when it:
- Appears repeatedly without a clear injury
- Suddenly becomes much more frequent
- Is unusually large or painful
- Occurs on the abdomen, back, chest, or face without explanation
- Appears with tiny red or purple spots
- Occurs with bleeding from the nose or gums
- Develops after starting a new medicine
- Is accompanied by fever, severe fatigue, swelling, or unexplained weight loss
Bruising alone is often harmless, but the pattern, location, and accompanying symptoms can reveal when it is time to look more closely.
