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Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Assessment online: the history, medication list and photos sort most bruising into harmless, medication-related or needing blood tests within one consultation; unexplained bruising then has its blood tests in person.
- What it is: blood leaking from damaged small vessels into the tissue under the skin; it fades from red-purple through green to yellow-brown over 1 to 2 weeks as the blood breaks down.
- Easy bruising: common causes are age-related skin thinning, sun damage, blood thinners, aspirin, steroids and some antidepressants, alcohol, and simply more knocks than you noticed; a minority involve low platelets or a clotting problem.
- Warning pattern: bruises without any knock, on the trunk, face or back, alongside pinhead purple dots, bleeding gums, nosebleeds, fatigue or fevers, need blood tests (a full blood count and clotting screen) promptly.
- Blood thinners: never stop a prescribed blood thinner because of bruising without medical advice; the clot risk is usually the greater danger, and a review of dose and interactions is the right response.
- Emergency: call 112 for a rash of tiny purple-red dots or bruises that do not fade under a glass together with fever, drowsiness, severe headache or vomiting, and after any head injury on blood thinners.
Call 112 or go straight to emergency care if bruising or a rash of tiny purple-red dots appears together with fever, drowsiness, severe headache or vomiting, if a bruise-like rash does not fade when a glass is pressed against it, or after any head injury while taking blood thinners. Arrange same-day in-person care for bruising with heavy nosebleeds, bleeding gums, blood in urine or stool, or for any unexplained bruise in a baby who is not yet crawling or walking.
When should I worry about bruising?
See a doctor about bruising that appears without any knock you remember, bruising that has become much easier or more frequent than usual, bruises together with bleeding gums, nosebleeds or blood in urine, bruising with fever, and any unexplained bruise in a baby not yet crawling or walking. These patterns need blood tests rather than creams.[1]
Most single bruises after a bump are harmless and fade over about two weeks. A video consultation on Mobi Doctor cannot run a blood test, and does not pretend to; what it can do is decide whether you need tests at all, which ones, and how urgently, which is precisely the question most people with new bruising are asking. You can see a doctor over video, usually within 15 minutes.
How an online consultation helps with bruising
- Honest triage first: the doctor tells you plainly which of three paths you are on: reassurance, routine blood tests within days, or same-day in-person care.
- Pattern recognition by photo: where bruises sit, their size and stage, and whether tiny blood-spot rashes (petechiae) are mixed in changes the assessment completely.
- A proper medication review: blood thinners, aspirin, steroids and several common medicines make bruising easier; the doctor reviews yours without you stopping anything on your own.
- No wasted weeks: where tests are needed, you leave the call knowing exactly which ones and how fast, instead of watching and worrying.
📷 Photograph each bruise in daylight next to a coin or ruler for scale, and note the date each one appeared. Add a close-up of any rash of tiny red or purple dots, and try the glass test first: press the side of a clear glass firmly over the marks and photograph what you see through it, because a rash that does not fade under pressure changes the urgency.
What the doctor checks in an online bruising consultation
The assessment is built around a short list of discriminating questions. In a bruising consultation, the doctor will typically check:
- The story of each bruise: a remembered knock or none, how long it has been there, and whether it is fading on schedule or still growing.
- The pattern: shins, knees, forearms and thighs are everyday bruising sites; bruises on the trunk, back, face or unusual places without injury count for more.[1]
- Other bleeding: gums that bleed with brushing, nosebleeds lasting more than ten minutes, periods that have become much heavier, blood in urine or stool, or prolonged oozing after small cuts.
- Petechiae: pinhead red-purple dots that do not blanch under a glass, which push the assessment toward urgent blood testing.[1]
- Your medicines: warfarin and the newer anticoagulants (apixaban, rivaroxaban, edoxaban, dabigatran), aspirin and clopidogrel, corticosteroids, some antidepressants (SSRIs), and interactions from recently added drugs such as antibiotics.[2]
- Alcohol, liver health and nutrition: heavy alcohol use and liver disease impair clotting; very restricted diets occasionally cause vitamin C or K deficiency.
- Systemic clues: fatigue, fevers, drenching night sweats, unexplained weight loss, repeated infections or swollen glands alongside bruising, which change the urgency of testing.[1]
- Age, skin and family history: thin, sun-damaged forearm skin in older adults, and any family history of bleeding disorders such as von Willebrand disease.
Why do I bruise so easily?
Easy bruising usually comes from fragile skin and small vessels rather than from a blood problem: ageing and sun-damaged skin, corticosteroids, and normal genetic variation all make bruises easier. Medicines such as anticoagulants and aspirin add to it. Less often, low platelets, clotting-factor problems or liver disease are responsible, which is what blood tests check.[3]
Age and skin changes
From middle age onward, many people notice dark purple, flat blotches on the forearms and backs of the hands after trivial contact. This is senile (actinic) purpura: decades of sun exposure thin the skin and the collagen supporting its small vessels, so minor shear tears them. The marks can take weeks to fade and often leave brownish staining. It is cosmetic rather than dangerous, and it does not need blood tests when the pattern is typical and there is no other bleeding.[3]
Medicines that make you bruise
Anticoagulants and antiplatelet drugs do their job by making blood clot less readily, so more frequent bruising is expected on them; what matters is a change from your usual pattern, very large or spontaneous bruises, or bleeding anywhere else. Corticosteroid tablets, and long-term steroid creams on the same area of skin, thin the skin itself. SSRIs and some herbal products (fish oil, ginkgo) have milder effects. Never stop a prescribed blood thinner because of bruising without medical advice: the clot risk it protects you from is usually far more dangerous than the bruises.[2]
When the blood itself is the problem
Low platelets (for example immune thrombocytopenia), clotting-factor disorders such as von Willebrand disease, liver disease, and, rarely, blood cancers such as leukaemia can all present as new easy bruising, typically with company: petechiae, bleeding gums, tiredness, fevers or infections.[5] These are exactly the cases the online consultation is designed to catch and fast-track to testing, because a simple blood count settles most of them within a day.[1]
What blood tests are needed for unexplained bruising?
The core tests are a full blood count, which measures platelets and screens for blood disorders, a clotting screen, and liver and kidney function tests; a blood film, ferritin and specific factor tests such as von Willebrand studies follow when the first round points that way. The tests themselves are done in person at a laboratory or clinic.[1]
What the online doctor adds is speed and direction: which tests you actually need, and on what clock. UK national guidance, for example, treats truly unexplained bruising as a symptom that merits an urgent full blood count, within about 48 hours, because it can occasionally be the first sign of a blood cancer; the doctor tells you how to get the right test done quickly where you are.[1] Most results are normal, and that reassurance is worth having quickly too.
How long does a bruise take to heal?
A typical bruise fades over one to two weeks, shifting from red-purple through green to yellow-brown as the leaked blood breaks down; a deep one can take three to four weeks. Review rather than wait if a bruise keeps enlarging, has not started fading by four weeks, or leaves a firm painful lump (a haematoma).
Location matters as much as time: blood tracks downward with gravity, so a thigh knock can surface at the knee, and a forehead bump can black an eye two days later. None of that is alarming by itself. A bruise over a joint that stops it moving normally deserves review too. What is never explained by gravity is a steady supply of new bruises without new knocks, and that is a testing question, not a waiting question.
Bruising in children, older adults and people on blood thinners
Active toddlers and school-age children collect bruises on shins, knees, foreheads and elbows, and that is normal childhood. Bruising in a baby who cannot yet crawl or walk is different and always needs a same-day, in-person medical assessment, as do bruises in unusual places (trunk, ears, neck, buttocks), petechiae, or bruising with fever in any child.[1] An online consultation can triage a worried parent quickly, and will say plainly when a child needs to be seen the same day, including ruling nothing in or out remotely.
In older adults, the usual explanation is senile purpura plus a medication list, but new bruising is also a prompt to review falls, alcohol and nutrition. On blood thinners, expect more bruises; seek urgent in-person care for any head injury, black or tar-like stools, blood in urine, a bruise that keeps expanding hour by hour, or bleeding that will not stop, and have your dosing and interactions reviewed rather than stopping the drug yourself.[2]
Bruising: which situation are you in?
This is the triage framework the doctors use, aligned with the cited guidance:[1]
Swipe sideways to compare →
| Presentation | Likely first step | Suitable for online care? | When referral or in-person care is needed |
|---|---|---|---|
| Bruise after a clear knock, fading through the colour cycle | Self-care: cold pack in the first day, elevation, simple pain relief | Yes, reassurance and advice | If it keeps enlarging, will not fade by four weeks, or a firm lump persists |
| Easy bruising on the forearms of older, sun-exposed skin | Assessment for senile purpura; skin protection and medication review | Usually yes | If bruising is widespread beyond the forearms or comes with any other bleeding |
| More bruising while on anticoagulants, aspirin or steroids | Structured medication and interaction review; blood test such as an INR where relevant | Yes for the review; tests in person | Head injury, black stools, blood in urine or uncontrolled bleeding: urgent in-person care |
| Unexplained bruising, petechiae, bleeding gums, fatigue or fevers | Urgent blood tests: full blood count, clotting screen, liver function[1] | Online for triage only | Testing in person, urgently, often within about 48 hours; emergency care if unwell |
| Non-blanching rash with fever or drowsiness, or bruising in a non-mobile baby | Emergency assessment | No | Always: call 112 or go to emergency care immediately[4] |
Not sure which row your bruising fits? A doctor can tell you in one consultation.
See available times →Treatment options for unexplained bruising
What you can do yourself
For an ordinary bruise: a cloth-wrapped cold pack for 10–15 minutes a few times during the first day or two, elevation of a bruised limb, and paracetamol for pain. Paracetamol is usually preferred over anti-inflammatory painkillers if you are bruising heavily or take blood thinners, because drugs like ibuprofen can add to bleeding tendency. Arnica creams are popular; the honest summary is that evidence for them is weak. Long sleeves and skin protectors help fragile forearm skin, and a daily moisturiser keeps thinned skin more resilient. What self-care cannot do is fix a clotting problem, which is why unexplained bruising is a testing matter, not a cream matter.
Prescription treatment
A prescription is never issued without a consultation, and for bruising the truthful point is stronger: there is no cream that meaningfully speeds a bruise, so the important prescriptions are usually the ones reviewed rather than added. After the assessment, the doctor may coordinate an anticoagulant or interaction review with the prescriber who manages it, correct a documented vitamin deficiency, treat an underlying condition, or refer you to haematology.[2] Where a bruise-like rash turns out to be something else entirely, an inflamed vessel rash or a spreading skin infection such as cellulitis, treatment follows that diagnosis instead.
When bruising is assessed online, and when you need in-person care
Treated online: reassurance and self-care for normal traumatic bruises; assessment of easy bruising with a full medication and history review; senile purpura advice; sorting bruises from bruise look-alikes such as skin rashes, allergic marks and infections; and follow-up once your blood results are back, to explain them and agree next steps.
In-person care: everyone with unexplained or rapidly increasing bruising goes for blood tests, urgently when petechiae, other bleeding or systemic symptoms are present; abnormal results go to haematology; any bruising in a non-mobile baby, and unusual bruising patterns in children, go to same-day in-person paediatric assessment without exception; and suspected meningococcal illness, a non-blanching rash with fever, goes to 112, not to a video queue. The consultation's value is that you find out which of these paths applies.
When to get in-person care
Call 112 immediately for a purple-red rash or bruising that does not fade under a pressed glass together with fever, drowsiness, severe headache, stiff neck or vomiting; these can be signs of meningococcal sepsis.[4] Do the same for uncontrollable bleeding, or head injury symptoms while on blood thinners. Get same-day emergency care for black tar-like stools, blood in urine, a bruise expanding hour by hour, or bruising with severe pain and a tense, swollen limb.
How Mobi Doctor works
- Book a time that suits you: open daily 7am–11pm CET. You can see a doctor over video, usually within 15 minutes. No subscription, exact price up front.
- Upload dated photos of your bruises, then speak to a licensed doctor: a private video call: you describe what you feel, the doctor asks what matters, and you agree the right plan together.
- Get your triage decision and plan: where tests or referral are needed, you leave knowing exactly which and how urgently, or you get a full refund.
No sign-up needed
Unexplained bruising can have more than one cause. Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
Tap the body — an area or a point — to browse symptoms anywhere
Not sure this is the right page? Look up any symptom in the full symptom checker, or book and describe it to a doctor.
Frequently asked questions about unexplained bruising
What is a bruise, and why does it change colour?
A bruise is blood that has leaked from small vessels damaged by a knock into the tissue under the skin. It looks red or purple at first, turns blue-black as the oxygen leaves the blood, then green and yellow-brown as the body breaks the haemoglobin down and clears it, fading over one to two weeks. Bruising on the shins and forearms clears slowest because circulation there is poorest.
Why am I suddenly bruising more easily?
Common explanations for easier bruising are age-related skin thinning, sun damage, a new or changed medicine (blood thinners, aspirin, steroids, some antidepressants, fish oil), alcohol, low vitamin C or K, or simply more knocks than you noticed. Because a minority of cases involve low platelets, liver disease or a clotting disorder, a sudden change in bruising with no new medicine deserves a blood count and clotting screen.
Can an online doctor find the cause of unexplained bruising?
An online doctor can narrow bruising down substantially: the history, medication list and photos sort most bruising into harmless, medication-related or needs-blood-tests within one consultation. What no online doctor can do is run the blood tests themselves, so for unexplained bruising the consultation ends with a specific test request, its urgency, and where to have it done near you.
What does a worrying bruise look like?
No single bruise looks reliably sinister; the worrying thing is the pattern. Bruises without any knock, in unusual places like the trunk, face or back, bruises that are large or raised, or bruising appearing alongside pinhead purple dots, bleeding gums, nosebleeds, fatigue or fevers, are the combinations that need blood tests promptly rather than watching and waiting.
Can bruising be a sign of leukaemia or a blood disorder?
Occasionally. Unexplained bruising, especially with pinhead purple dots, bleeding gums, frequent nosebleeds, persistent tiredness, pallor, recurrent infections or night sweats, can be the first sign of low platelets, leukaemia, liver disease or a clotting disorder. A full blood count, often done within a day or two, answers the question; most people who have it turn out to have a harmless cause of their bruising.
What blood tests are needed for unexplained bruising?
The standard first tests for unexplained bruising are a full blood count (platelets above all), a clotting screen, liver and kidney function and sometimes vitamin C, vitamin K or specific clotting-factor tests. The online doctor specifies the panel and its urgency, you have the blood taken at a laboratory near you, and the results are reviewed at a follow-up consultation.
How long does a bruise take to heal?
A typical bruise heals in one to two weeks, changing colour from purple to green to yellow as the blood breaks down; large deep bruises and bruises on the legs can take three to four weeks. A bruise that is still hard, swollen or painful after two weeks, keeps growing, or leaves a firm lump may be a haematoma or a bruise that has bled again and is worth a review.
How do I get rid of a bruise faster?
To help a bruise heal faster, apply a cold pack wrapped in cloth for about ten minutes several times in the first day to limit bleeding, raise the bruised limb, rest it, then from day two use gentle warmth to speed the clearing. Paracetamol eases pain; ibuprofen and aspirin can increase bruising. Nothing shortens a bruise dramatically, and a typical one clears in one to two weeks regardless.
Does arnica actually work on bruises?
The evidence for arnica on bruising is weak and inconsistent, so the honest answer is: probably not much. A cold pack in the first day, elevation and time do the real work, and a typical bruise clears in one to two weeks regardless. Arnica creams are harmless on intact skin if you want to use one; vitamin K creams have slightly better evidence for bruising after procedures.
Should I stop my blood thinner if I keep bruising?
No, never on your own. More bruising is an expected effect of anticoagulants, and stopping one abruptly can expose you to the stroke or clot risk it was prescribed to prevent. The right response to bruising on a blood thinner is a review: dose, interactions with new medicines, and, for warfarin, an INR test; bleeding that will not stop, black stools or a head injury need emergency care.
When should a bruise on a child or an older person worry me?
Bruises on the shins, knees and forehead of a mobile child are normal; any bruise in a baby who cannot yet crawl, bruises on the trunk, ears, neck or buttocks, a dot-like rash, or bruising with fever or drowsiness need in-person assessment the same way. In older people, thin-skinned purple patches on the forearms are usually harmless senile purpura, but new widespread bruising on a blood thinner or with falls needs review.
How can I prevent bruising?
Reduce bruising by protecting thin skin (long sleeves for gardening, padding sharp furniture corners, good lighting to prevent knocks), moisturising and using sunscreen to limit further skin thinning, limiting alcohol, eating enough vitamin C and K from fruit, vegetables and greens, and reviewing medicines that increase bruising with a doctor rather than stopping them. Strength and balance exercise prevents the falls behind much bruising in older people.
- Suspected cancer: recognition and referral (NG12), National Institute for Health and Care Excellence, updated 2023.
- Anticoagulation, oral: Clinical Knowledge Summary, NICE Clinical Knowledge Summaries, revised 2024.
- Senile purpura, DermNet New Zealand Trust, updated 2023.
- Meningitis: fact sheet, World Health Organization, 2025.
- Purpura: causes and types, DermNet, DermNet New Zealand Trust, accessed August 2026.
- Bruises, NHS, National Health Service (UK), accessed October 2026.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
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