A bruise on a healthy adult typically clears up in about two weeks, cycling through a predictable palette of colors: pinkish-red to deep purple, then green, dark yellow, and finally pale yellow before disappearing entirely. If yours are lasting well beyond that window, something is interfering with either the clotting process, the cleanup of leaked blood beneath the skin, or both. The causes range from simple and fixable to worth investigating with a doctor.
How a Bruise Normally Heals
When you bump into something hard enough to break tiny blood vessels under the skin, blood leaks into the surrounding tissue. Your body immediately starts sealing the damaged vessels with a clot, then sends specialized cells to break down and reabsorb the pooled blood. Each color change you see reflects a stage of that chemical breakdown. The whole cycle, from impact to invisible, runs about 14 days in most cases.
That two-week timeline is a rough average. Where the bruise sits on your body matters. A bruise on your leg will almost always take longer to heal than one on your face or arm. Gravity pulls leaked blood downward, which can even cause the bruise to spread over time. Lower legs also have comparatively less blood flow than areas closer to the heart, which slows the cleanup process.
Age and Skin Changes
If you’re over 50 and noticing that bruises seem bigger, easier to get, and slower to fade, your skin itself is a major factor. With age, the dermis (the thick middle layer of skin) loses volume as collagen and elastin fibers break down. Enzymes that dismantle these structural proteins become more active in older skin, while the molecules that normally protect against that breakdown become less active. The result is thinner, more fragile skin that offers less cushioning for the blood vessels underneath.
At the same time, a substance called hyaluronic acid, which normally keeps the skin hydrated and resistant to shearing forces, diminishes with age. This leaves skin more vulnerable to tears and vessel damage from even minor bumps. Older adults commonly develop what’s called senile purpura: flat, reddish-purple patches that appear on the forearms and hands after minimal contact. These typically resolve in one to three weeks like a normal bruise but often leave behind a brownish-yellow stain from iron deposits in the skin that can persist much longer. Delayed healing is especially common on the lower legs, where the skin’s reduced ability to regenerate cells and repair tissue makes recovery noticeably slower.
Medications That Slow Clotting
Blood-thinning medications are one of the most common reasons bruises linger. These drugs fall into two broad categories, and both can extend how long a bruise sticks around.
- Antiplatelet drugs (like aspirin and clopidogrel) prevent platelets from clumping together to form the initial plug that seals a damaged vessel. Without that quick seal, more blood leaks into the tissue before clotting begins.
- Anticoagulants (like warfarin, rivaroxaban, and apixaban) slow down the chain reaction that builds a full blood clot. They’re effective at preventing dangerous clots in the heart or lungs, but the trade-off is that minor injuries bleed more freely under the skin.
Over-the-counter pain relievers like ibuprofen and naproxen also have mild blood-thinning effects. If you take them regularly, they can contribute to larger, longer-lasting bruises. Even occasional use before or after an injury can make a difference.
Long-Term Steroid Use
Corticosteroids, whether applied to the skin as creams or taken orally for conditions like asthma or autoimmune disorders, thin the skin over time. This is a well-documented side effect of chronic use rather than short courses. Thinner skin means less protection for blood vessels, which leads to easier bruising and slower resolution. If you’ve been on corticosteroids for months or years and notice more frequent bruising, the medication is a likely contributor.
Nutritional Deficiencies
Your body needs specific nutrients to maintain blood vessels and build clotting proteins. Two stand out when it comes to bruising.
Vitamin K is essential for producing several of the proteins your blood needs to clot properly. When vitamin K levels drop too low, those clotting proteins don’t function effectively, and even small injuries can cause prolonged bleeding under the skin. People who consume less than about 60 micrograms of vitamin K daily start to show measurable changes in clotting ability. Leafy greens like kale, spinach, and broccoli are the richest dietary sources.
Vitamin C plays a different but equally important role. It’s needed to build and maintain collagen, the structural protein that keeps blood vessel walls strong. Without enough vitamin C, capillaries become fragile and leak more easily. Severe deficiency (scurvy) causes spontaneous bruising and bleeding gums, but even moderate shortfalls can make bruises appear more readily and heal more slowly.
Low Platelet Count
Platelets are the tiny cell fragments that rush to a damaged blood vessel and form the first plug. A normal platelet count runs between 150,000 and 400,000 per microliter of blood. When the count drops, bruising becomes more common. Mild drops (100,000 to 150,000) usually cause no noticeable symptoms. Once the count falls into the moderate range (50,000 to 100,000), easy bruising often appears. Below 20,000, spontaneous bleeding without any injury becomes a real risk.
Low platelet counts can result from bone marrow problems, certain infections, autoimmune conditions, or as a side effect of some medications. If you’re bruising without any clear cause, a simple blood test can check your platelet levels.
Liver Disease
The liver manufactures most of the proteins involved in blood clotting. When the liver isn’t functioning well, whether from chronic alcohol use, hepatitis, fatty liver disease, or cirrhosis, the production of these clotting proteins drops significantly. The liver also produces the hormone that regulates platelet production, so liver disease can reduce platelet counts at the same time.
People with liver damage often develop deficiencies in multiple clotting factors simultaneously, which compounds the problem. Bruises in someone with liver disease tend to be larger, appear with less provocation, and take noticeably longer to clear. Persistent, unexplained bruising alongside other signs like fatigue, yellowing skin, or abdominal swelling can point to liver problems worth investigating.
Bleeding Disorders
Some people have inherited conditions that interfere with normal clotting. Von Willebrand disease is the most common, affecting up to 1% of the population. It involves a shortage or malfunction of a specific protein that helps platelets stick to damaged vessel walls. People with this condition often notice lifelong patterns of easy bruising, heavy menstrual bleeding, or prolonged bleeding after dental work or minor cuts.
Diagnosis involves blood tests that measure how much of the clotting protein is present and whether it’s working correctly. A doctor will also ask about your personal and family history of unusual bleeding. Many people with mild forms go undiagnosed for years, attributing their bruising to being “clumsy” or having sensitive skin.
When Slow-Healing Bruises Are a Red Flag
A single bruise that takes a bit longer than usual to fade, especially on your shin or lower leg, is rarely a concern. But certain patterns warrant a closer look. Bruising that consistently lasts more than two weeks, large bruises that appear without a clear injury, a lump forming within a bruise, painful swelling that doesn’t improve after several days, or bruises that keep recurring in the same spot all deserve medical attention. Unexplained bruising paired with unusual bleeding elsewhere, like nosebleeds, blood in your urine, or bleeding gums, is especially important to bring up, as it can signal a systemic problem with clotting.