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Lipoedema30 September 20267 min read

Frequent bruises on the legs – a cause for concern?

Another bruise on your shin – and you cannot remember knocking it? Haematomas on the legs are common and in most cases harmless.

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The key points in brief

  • Usually harmlessIndividual haematomas on the shin, knee or thigh are usually caused by minor knocks and heal on their own.

  • Get it checkedRecurring bruises without an obvious cause, additional bleeding or a noticeable change should be checked by your GP.

  • LipoedemaWith lipoedema, pain, tenderness to pressure and a symmetrical, disproportionate distribution of fat are more decisive than bruises.

However, if bruises suddenly occur much more often, become unusually large or are accompanied by other symptoms, a medical assessment makes sense.

The following applies: frequent bruises can have many causes. Besides small, unnoticed knocks, possible factors include personal predisposition, age, certain medications or – much more rarely – blood clotting disorders. People with lipoedema also report a tendency to bruise. However, bruises alone are explicitly not sufficient for this diagnosis.

Unsure whether your bruises should be checked?

At the Westfalenklinik Dortmund, we assess symptoms in context – not on the basis of a single symptom. Bruises are rarely meaningful on their own; what matters is the overall picture of the course, accompanying symptoms and physical findings. If painful, symmetrical changes in your legs are also present, a medical assessment is worthwhile.

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What is a bruise?

In medical terms, a bruise is referred to as a haematoma. It occurs when small blood vessels under the skin are injured. Blood leaks into the surrounding tissue and becomes visible there. The skin usually remains intact.

As the body breaks down the leaked blood, the colour changes: a haematoma may initially appear reddish or dark, later turning blue-violet, greenish and finally yellow-brown. This change of colour is part of the normal healing process. Depending on size, location and personal predisposition, it can take one to three weeks for the mark to disappear completely – larger bruises even longer.

Why do bruises occur particularly often on the legs?

Our legs are exposed to many small strains in everyday life. Table edges, bed frames, shopping bags, sports equipment or getting into the car are often at exactly the height of the lower legs and thighs. A light knock is not always consciously noticed – the bruise is often only spotted later when showering or getting changed.

On the shin, the skin also lies comparatively close to the bone. The tissue there is less able to cushion a knock. People who do a lot of sport, do physical work or tend to have sensitive blood vessels may therefore discover haematomas on their legs more often than on other parts of the body.

Woman measuring the circumference of her thigh with a tape measure

Common causes of bruises on the legs

The cause cannot be determined reliably from the colour or size of a single mark. The context usually helps: was there any strain? Are any medications being taken? Is there additional bleeding or are there other symptoms?

Possible cause Typical context
Unnoticed knocks or contusions Often on the shin, knee or thigh; an everyday contact can often be identified in hindsight.
Sport and physical exertion Contact, pressure or repeated small injuries can put strain on blood vessels in the tissue.
Personal predisposition Some people develop visible haematomas after only minor impact, without any illness being present.
Age and thinning skin With increasing age, the protective layer of tissue decreases; blood vessels can be injured more easily.
Medications Anticoagulants and antiplatelet drugs can promote bruising; never change the treatment on your own.
Clotting or platelet disorder Have this checked by a doctor, especially in the case of spontaneous haematomas, petechiae, nosebleeds or bleeding gums.
Liver disease or other underlying condition Rare; there are usually other symptoms or abnormal laboratory values.
Pronounced vitamin deficiency A vitamin C or vitamin K deficiency can promote bleeding, but it is not a diagnosis that should be made on the basis of bruises alone.

What does “frequent” mean with bruises?

There is no fixed number above which bruises are automatically a sign of illness. What matters more is the change compared with what is normal for you personally. If you have always bruised relatively easily and nothing about this has changed, it is usually less of a concern than a tendency to bruise that suddenly appears.

So pay attention to how the bruises develop and the circumstances: do the bruises appear for no obvious reason? Are they getting larger or more painful? Do you also have small pinpoint bleeds, nosebleeds or unusually heavy bleeding after minor injuries? Information like this helps the doctor to assess the situation.

When should bruises be checked by a doctor?

An occasional bruise after a knock does not usually need to be examined. However, make an appointment with your GP practice if one or more of the following apply:

  • The haematomas suddenly occur much more often than before.
  • Bruises repeatedly appear for no obvious reason.
  • The bruises are unusually large, very painful or form a palpable swelling.
  • You also have nosebleeds, bleeding gums or noticeably prolonged bleeding.
  • Many small red, purple or brownish spots appear that do not heal like normal haematomas.
  • You take medicines that affect blood clotting and notice a clear change.
  • Clotting disorders or a pronounced tendency to bleed are known in your family.

When prompt help is important

After a more serious injury, with rapidly increasing swelling or very severe pain, the situation should be assessed by a doctor immediately. In the event of shortness of breath, chest pain, impaired consciousness or rapid deterioration, call the emergency number 112. A leg that is suddenly swollen, warm and painful on one side is not a typical bruise and must be checked promptly because of possible vascular problems.

Five women in light-coloured underwear seen from behind

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Bruises and lipoedema: what is really meaningful?

Many women with lipoedema report that even light touches or small knocks leave visible haematomas. However, the current medical guideline makes it clear that a tendency to bruise cannot be used as a decisive diagnostic criterion. In addition, in a comparative study it could not be objectively confirmed in patients with lipoedema.

When lipoedema is suspected, it is therefore always the overall picture that matters. The condition is described as a painful, disproportionate and symmetrical disorder of the distribution of fat tissue in the limbs. Typical signs are:

  • Symmetrical changes

    Both legs or both arms are affected to a comparable degree.

  • Disproportion

    Legs or arms appear clearly bulkier in relation to the trunk.

  • Pain

    The fat tissue is painful when pressed or touched; a feeling of tension or heaviness or spontaneous pain is also possible.

  • Hands and feet are spared

    The fat distribution often ends above the wrists or ankles.

Bruises can accompany these symptoms, but on their own they are not proof of lipoedema. You can find out more about telling them apart in the Westfalenklinik guide “Lipoedema or just heavy legs – what is the difference?”.

How are frequent bruises investigated?

The first point of contact is usually your GP practice. There, your personal and family history, new symptoms, injuries and all the medicines and preparations you take are recorded first. Over-the-counter painkillers or herbal products can also be important for the assessment.

Depending on the findings, a blood count including platelets, clotting values or further laboratory tests may be useful. Which values are actually needed is decided individually by the treating doctor. Anticoagulant medicines must never be reduced or stopped on your own initiative.

If lipoedema is suspected because of painful, symmetrical and disproportionate changes in the legs or arms, a clinical examination by a specialist is also necessary. A single laboratory value or an online self-test cannot prove the diagnosis.

What helps with a fresh bruise?

After a light knock, simple measures can relieve discomfort:

  • Cool briefly

    Wrap a cool pack in a cloth and do not place it directly on the skin.

  • Elevate

    If possible, rest the affected leg in a slightly raised position.

  • Rest

    Avoid strong pressure or renewed strain on the area for the time being.

  • Observe

    Keep an eye on size, colour, pain and how it heals.

Creams or home remedies do not reliably make a bruise “disappear”. If haematomas are very painful, getting worse or last an unusually long time, a medical assessment is advisable.

Conclusion: usually harmless – but take changes seriously

Bruises on the legs are often caused by small, unnoticed knocks and are usually no cause for concern. They become noteworthy above all when they keep appearing for no obvious reason, suddenly become much more frequent or occur together with other bleeding, pain or swelling.

Lipoedema is only one of several possible explanations. Haematomas alone do not allow a diagnosis. If your legs are also painful to pressure on both sides, heavy and clearly bulkier than the upper body, an examination by a specialist can provide clarity.

Do your symptoms fit possible lipoedema?

The doctors at the Westfalenklinik Dortmund look not only at individual symptoms but at the whole clinical picture. Have painful and symmetrical changes in your legs assessed in person.

Medical note: This article is for general information and does not replace a medical examination, diagnosis or treatment. If you have acute or severe symptoms, please contact a doctor or the responsible out-of-hours medical service; in a life-threatening situation, call the emergency number 112.

Sources and medical basis

  1. Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften (AWMF): S2k guideline Lipoedema, register number 037-012, version 5.0 of 22 January 2024, valid until 22 January 2029. register.awmf.org/de/leitlinien/detail/037-012 Open source
  2. BARMER: Bruises – how they develop and how to get rid of them faster. Open source
  3. Apotheken Umschau: Do some people really bruise more easily? Medically reviewed, 28 May 2025. Open source
  4. MSD Manual: Bruising and bleeding, reviewed/revised September 2025. Open source
  5. gesund.bund.de: Clotting disorders – symptoms and treatment. Open source

Sources as at: 30 September 2026

Frequently asked questions

Why do I get bruises even though I have not knocked myself?

Often a light knock simply went unnoticed or was forgotten. However, if the haematomas repeatedly appear spontaneously or your previous tendency to bruise changes significantly, the cause should be checked by your GP.

Which deficiency can cause bruises?

A pronounced vitamin C or vitamin K deficiency can promote bleeding. However, such deficiencies cannot be diagnosed on the basis of bruises. Iron deficiency should also not be assumed to be the cause or treated on your own without an examination.

Which medicines can promote bruising?

Above all, medicines that inhibit blood clotting or the function of platelets can promote haematomas. These include, for example, anticoagulants prescribed by a doctor. Never change how you take them without consulting your doctor.

Are bruises a sign of lipoedema?

They can occur together with lipoedema, but they are not a decisive diagnostic criterion. More meaningful are a painful, symmetrical and disproportionate distribution of fat on the legs or arms and pain on pressure and touch.

Are bruises a sign of thrombosis?

An ordinary haematoma is bleeding into the tissue and not the same as a blood clot in a vein. However, a leg that is suddenly swollen, warm and painful on one side must be checked by a doctor promptly, regardless of whether a mark is visible.

What is the difference between petechiae and bruises?

Petechiae are very small pinpoint bleeds, whereas haematomas usually form larger, flat areas of discolouration. New or numerous petechiae should be assessed by a doctor – especially if further bleeding or general symptoms occur.

How long does it take for a bruise to disappear?

Small haematomas often fade within one to three weeks; larger ones can remain visible for longer. What matters is that they gradually become lighter and less painful. If there is no improvement or they get worse, an examination should take place.

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