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Supplements, medicines and home safety for older adults, written for the people who care for them

Why Older Adults Bruise More Easily: Skin Changes, Medicines, and When to Ask

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Older adults often bruise more easily because the skin and the small blood vessels beneath it change with age. Some medicines can also play a part, and a bruise nobody can explain is a separate question again. These three ideas overlap and get mixed up often, and mixing them up can lead a family to say nothing when they should speak up, or to change a medicine when they should not. This guide separates them and lists what to bring to a clinician.

This article is general educational information, not medical advice. It has not been reviewed by a clinician. It cannot tell you why a particular person is bruising.

The short answer

The National Institute on Aging (NIA) explains that the outer layer of skin gets thinner, paler and less stretchy with age, and that blood vessels become more fragile, so older adults tend to bruise more easily. NIA also says some medicines or illnesses may cause bruising, and that older adults should talk to a doctor about bruises they cannot explain, especially on parts of the body usually covered by clothing.

MedlinePlus, from the National Library of Medicine, says bleeding is the most common side effect of blood thinners, and it lists “unusual bruising” among the signs of serious bleeding that should prompt a call to a provider.

So there are three ideas to keep apart: fragile skin, medicines that affect clotting, and bruising with no known cause. They are not either-or. One person can have more than one at the same time, which is part of why a clinician needs the full picture.

Annotated comparison: three ideas that look alike

Each item below covers what it is, what the sources support, and where the evidence stops.

1. Aging skin fragility

  • What it is: a change in the skin and the tiny vessels under it. NIA describes a loss of elastic fibers (elastin) and collagen that makes skin more fragile.
  • What the source says about bruising: older adults may bruise more easily than younger people, and it can take longer for those bruises to heal.
  • Evidence limit: NIA does not provide a number for how many bruises are normal or a safe size. Please do not treat any count or size as a cutoff.

2. Medicines that affect platelets or clotting

  • What it is: MedlinePlus describes two types of blood thinners. Anticoagulants, such as heparin or warfarin (Coumadin), slow the body's clotting process. Antiplatelets, such as aspirin and clopidogrel, keep platelets from clumping together to form a clot.
  • Why it matters for bruising: MedlinePlus lists bleeding as the most common side effect of blood thinners and recommends calling a provider about unusual bruising. It also says blood thinners may interact with certain foods, medicines, vitamins, and alcohol.
  • Evidence limit: neither source says how much any one medicine raises bruising, or whether a particular bruise comes from a medicine. Only the prescriber can weigh that. MedlinePlus explains that these medicines are used to prevent clots, so a bruise is not a reason to stop one on your own. Ask the prescriber first.
  • Easy to miss: aspirin is on MedlinePlus's list of antiplatelets. When you build a medicine list, ask whether the person takes any aspirin product and write it down, even if nobody thinks of it as “a medicine.”

3. Unexplained bruising

  • What it is: not a cause, but a description. It means nobody knows how the bruise happened.
  • What the source says: NIA advises talking to a doctor about bruises you do not know the cause of, especially on parts of the body usually covered by clothing. NIA also says accidental bruises are common in older adults but can sometimes be a sign of elder abuse, and that anyone who suspects abuse should seek help.
  • Evidence limit: “unexplained” does not mean serious, and it does not mean harmless. It means a clinician should hear about it.

A worked example: what confusing the three can cost

Assumptions: this is an invented example, not a real person and not a case study. It shows how the ideas can be confused. It does not diagnose anyone, and it cannot say what any real bruise means.

Imagine a man in his eighties who takes a daily aspirin. His daughter notices a dark patch on his forearm and, a week later, two more on his torso. Nobody saw him bump into anything.

Mix-up A: “It's just thin skin.” The family assumes aging skin explains everything and mentions nothing at the next appointment. The aspirin is not on the list the clinic has, and nobody says the torso bruises were new or that no one saw an injury. The clinician never gets the details needed to sort out the cause.

Mix-up B: “It must be the aspirin.” The family blames the aspirin and stops it without asking. The aspirin was taken for a reason, and stopping it alone may undo that reason. It may not have been the cause at all, and nobody has looked into the new torso bruises yet.

The better path: treat it as three separate questions. Fragile skin may be part of it. A medicine may be part of it. The torso bruises with no remembered cause need the most clinician attention, which fits NIA's advice about covered areas. The daughter writes down what she saw, lists every medicine and supplement including the aspirin, and calls the clinic. The prescriber decides about the medicine, and nobody stops it before that conversation.

What this example cannot show: it cannot say which explanation would turn out to be right. That takes an examination, and possibly tests, which only a clinician can arrange.

What to bring to a clinician

You don't need medical training to collect these details. Write them down before the visit, since a list is easier to use than memory in a short appointment.

  • Where the bruises are: note whether any are on covered areas such as the torso or back, since NIA specifically flags those for discussion.
  • When they appeared and how they changed: a short note per bruise with dates is enough. Say whether this is new for this person or has always been the pattern.
  • What happened: a bump, a fall, a grab during a transfer, or nothing anyone remembers. “We don't know” is a useful answer.
  • Every medicine and supplement: prescriptions, aspirin or other pain relievers, vitamins and herbal products, with doses and start dates. MedlinePlus says the provider needs to know all medicines and supplements you use. Include anything started or changed recently.
  • Other bleeding: from the MedlinePlus list, such as gum or nose bleeding that does not stop quickly, red or brown urine, or red or black bowel movements.
  • Falls or head bumps: MedlinePlus lists a serious fall or bump to the head as a reason to call a provider about blood thinners.
  • Your questions: for example, “Could any of these medicines be involved?” and “Which signs should send us to urgent care for this person?”

When to call sooner

MedlinePlus says to call a provider about signs of serious bleeding, including unusual bruising, a cut that does not stop bleeding, vomit that is brown or bright red, coughing up something red, severe pain such as a headache or stomachache, dizziness or weakness, and a serious fall or bump on the head. If someone seems very unwell and you cannot reach the clinic, contact emergency services. It also helps to ask the clinician ahead of time which signs should mean emergency care for this particular person, since that can depend on their health and medicines.

If you worry that a bruise may have been caused by another person, NIA says to seek help. Raise it with the clinician or the appropriate local services.

Skin care for caregivers

For caregivers who help with bathing, NIA suggests mild soap and a skin moisturizer, and drying between skin folds. NIA also warns that bath oil can make a tub slippery and increase the risk of falling. These are general skin-care tips. The sources do not say they prevent bruising.

Where the evidence stops

  • The two sources reviewed are general public-health pages. They describe patterns and say when to talk to a clinician. They give no thresholds, no risk percentages, and no way to tell the cause by looking at a bruise.
  • We did not review studies comparing bruising between specific medicines.
  • Nothing here is a diagnosis, and nothing here suggests starting, stopping or changing any medicine or supplement.

Related reading on this site

Sources

National Institute on Aging. Skin Care and Aging. Content reviewed February 11, 2025.

MedlinePlus, National Library of Medicine. Blood Thinners. Last updated June 27, 2024.

By MercyAssistedCare.org Editorial Team. This article is for general information only and does not constitute medical advice. Talk to a doctor or pharmacist about any bruising or medicine question for a specific person.

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