Why older adults bruise so easily, and when to worry

It usually starts with a bruise nobody remembers earning. A purple patch on the forearm, a smudge across the back of a hand, and no bumped doorway to blame. For the adult child who notices it on a Sunday visit, the first thought is often the most alarming one. Most of the time, though, nothing is wrong. Older adults bruise so easily because of ordinary changes in the skin and blood vessels, not disease.

Usually harmless isn't the same as always harmless. This guide explains why the bruises appear, how to read them, which ones deserve a phone call, and the small changes that keep a parent's arms from mapping every doorway in the house. None of it replaces a doctor's judgment, especially for anyone on a blood thinner.

Thin skin and fragile vessels

A bruise is blood that has escaped. When a tiny vessel near the surface breaks, blood leaks into the surrounding tissue and shows through until the body reabsorbs it. In a younger person that takes a real knock. In an older one, it can take almost nothing.

Three changes add up. The skin grows thinner and less elastic. The fat layer beneath it, which used to cushion blood vessels against everyday bumps, wears away. And years of sunlight weaken the collagen that supports the vessel walls. The National Institute on Aging notes that blood vessels become more fragile with age, so older adults bruise more easily and bruises take longer to heal. A vessel that would have survived a knock at forty gives way at eighty against the corner of a kitchen counter.

Senile purpura: an alarming name for a harmless bruise

The most common version has an unfortunate name. Senile purpura, also called actinic purpura, is flat, dark red or purple bruising that appears again and again on the forearms and backs of the hands. Despite the name, it isn't a sign that anything is failing. It is fragile, sun-worn vessels doing what fragile vessels do.

These marks are often more sharply outlined than a bump bruise, and they favor the skin that saw the most sun over a lifetime. They can last one to three weeks and sometimes leave a faint brown stain for months. They are more common in people with fair skin. It is worth having a doctor confirm the diagnosis once, mostly to rule out other causes. After that, it is cosmetic.

The medicine cabinet

When bruising suddenly gets worse, the cause is often in the medicine cabinet. Many common drugs slow clotting or thin the skin, and in someone who already bruises easily they turn a minor bump into a dramatic mark.

• Blood thinners and antiplatelet drugs, such as warfarin, apixaban, rivaroxaban and clopidogrel, which prevent dangerous clots and make bruising easier as a side effect.
• Aspirin and anti-inflammatory pain relievers such as ibuprofen and naproxen, which interfere with the platelets that stop bleeding.
• Corticosteroids such as prednisone, which thin the skin.
• Some antidepressants, which can affect platelets.
• Supplements such as fish oil, ginkgo and vitamin E. The Mayo Clinic notes that some supplements, ginkgo among them, have a blood-thinning effect of their own.

Don't stop anything on your own. A blood thinner is usually preventing something far more dangerous than a bruise, such as a stroke. A jump in bruising is a reason to sit down with a doctor or pharmacist and review the whole list, prescriptions and supplements together, which is part of the routine medication management every older adult on several medicines should have.

How to read a bruise

A bruise keeps a rough calendar of its age. A new one starts red or purple, then darkens and shifts toward brown, green and finally yellow as the body clears the trapped blood. A mark that moves through those colors and shrinks is doing exactly what it should.

Location matters too. Ordinary bruises live on the arms, legs and backs of the hands, the places that bump into the world all day. One pattern is worth learning by sight: pinpoint red or purple dots the size of a pen tip, called petechiae. Unlike a normal bruise, they can point to a bleeding problem rather than a bump.

Bruises worth a phone call

Nearly all age-related bruising is harmless. Knowing the short list of exceptions lets you relax about the rest. Call the doctor about:

• Frequent or large bruises with no injury to explain them.
• Bruises on the trunk, back or face rather than the arms and legs.
• Pinpoint red or purple dots (petechiae).
• Bruising along with bleeding gums, frequent nosebleeds, or blood in the urine or stool.
• A bruise that keeps growing, is very painful, or doesn't heal.
• A sudden increase in bruising in someone who never used to bruise, especially with tiredness or feeling unwell.

Occasionally the cause is a low platelet count, a clotting problem, liver disease or a shortage of vitamin C or K. A blood test settles most of these questions, which is why they're worth raising instead of worrying about in silence.

The question families are afraid to ask

One worry often goes unspoken when an adult child keeps finding bruises on a parent, especially a parent with help at home: could someone be hurting them? It deserves a calm, honest answer.

Most bruises on older adults are accidental, and they follow the accidental pattern: small, on the arms, legs and hands. Bruises on the neck, chest, back or face are harder to get by accident. So are marks shaped like a hand, a grip or an object, matching injuries on both sides of the body, and bruises the person can't explain or seems uneasy discussing. Behavior can say more than skin: a parent who becomes fearful, withdrawn or tense around one particular person is telling you something.

If your instinct says something is wrong, act on it. The Eldercare Locator connects families to local Adult Protective Services, which investigates exactly these concerns. Call 911 if someone is in immediate danger. Asking the question doesn't accuse anyone. It protects someone who may not be able to protect themselves.

Everyday ways to head off bruises

You can't undo thin skin, but you can make bruises less frequent. Moisturize daily so the skin stays a little more supple. Protect it from the sun that weakened it in the first place. Long sleeves and long pants put a layer of cloth between fragile arms and the world, which is why many older adults switch to them year-round.

Many bruises come from falls and near-falls, so the house matters as much as the skin. Clear rugs and clutter from walkways, light the dim corners and the path to the bathroom, pad sharp corners on coffee tables and bed frames, and use a cane or walker without embarrassment. The fixes that prevent a bruise also prevent the worse injury behind it; our guide to preventing falls at home walks through them room by room. For a fresh bump, a cold pack and gentle elevation in the first day keep the mark smaller. Check with a doctor before trying vitamin K or arnica, especially with a blood thinner in the picture.

A caregiver who helps with bathing and dressing sees the skin every day, and is often the first to notice that bruises are multiplying, changing or turning up somewhere they shouldn't. That daily attention, a hazard-free house and a medication list someone is actually watching are ordinary work that catches changes early. In Pennsylvania, our Lehigh Valley office serves families throughout the Lehigh Valley.

This article is general information, not medical advice. Talk with a doctor about unexplained or changing bruising, and never stop a blood thinner without your prescriber's guidance.