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Learn about your knee bruise, including causes and common questions. Or get a personalized analysis of your knee bruise from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

Knee Bruise Checker

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Your Knee Bruise May Also be Known as:
Bruise on knee
Bruise on leg
Bruised knee
Bruised leg
Knee bruising
Knee is bruised
Leg bruising
Leg is bruised

Top 5 Knee Bruise Causes

  1. 1.Allergic Contact Dermatitis of the Lower Leg

    Allergic contact dermatitis is a condition in which the skin becomes irritated and inflamed following physical contact with an allergen. Common products known to cause allergic dermatitis include plants, metals, soap, fragrance, and cosmetics.

    You can safely treat this condition on at home. The main treatment for this disease is to avoid the substance that triggers the skin inflammation. Moisturizer can also be helpful to provide relief for your inflamed skin.

    Rarity:
    Common
    Top Symptoms:
    lower leg redness, lower leg itch, scabbed area of the lower leg
    Symptoms that always occur with allergic contact dermatitis of the lower leg:
    lower leg redness
    Urgency:
    Self-treatment
  2. 2.Acl Injury

    The ACL (anterior cruciate ligament) is a super-important tendon that connects the femur (thigh bone) to the tibia (shin), keeping the tibia from flying forward every time a step is taken. Tearing happens in a lot of accidents and sports, unfortunately.

    You should seek immediate medical care at an ER. An ACL tear is very painful and requires surgery, and the sooner that happens, the better the outcome.

    Rarity:
    Rare
    Top Symptoms:
    knee pain, pain in one knee, knee instability, knee pain from an injury, swollen knee
    Symptoms that always occur with acl injury:
    knee pain
    Symptoms that never occur with acl injury:
    mild knee pain
    Urgency:
    Hospital emergency room

    Knee Bruise Checker

    Take a quiz to find out why you’re having knee bruise.

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  3. 3.Lower Leg Weakness

    Any leg weakness is a sign of nerve damage, which is very worrisome and requires you to go see a doctor immediately!

    There may be several explanations for this symptom and its severity, but a healthcare professional should make an assessment as soon as possible because it may be serious.

    Rarity:
    Uncommon
    Top Symptoms:
    lower leg weakness, foot weakness, arm weakness, odd walking gait, severe pelvis pain
    Urgency:
    Hospital emergency room
  4. 4.Skin Infection of the Knee

    Cellulitis is an infection of the skin and tissues underneath it. It is most commonly caused by Group A strep and typically enters the body through a break in the skin.

    You should go to your primary care doctor tomorrow. There, he or she will inspect your skin and determine if antibiotics are necessary.

    Rarity:
    Uncommon
    Top Symptoms:
    fever, knee pain, knee redness, knee injury, painful knee swelling
    Symptoms that always occur with skin infection of the knee:
    knee redness
    Urgency:
    Primary care doctor
  5. 5.Meniscal Injury

    A torn meniscus is one of the most common knee injuries. Any activity that causes forceful twisting of the knee, especially when putting the pressure of one's full weight on it, can lead to a torn meniscus.

    Conservative treatment such as rest, ice and medication is sometimes enough to relieve the pain of a torn meniscus and give the injury time to heal on its own. In other cases, however, a torn meniscus requires surgical repair, which can be best determined by your doctor or physiotherapist.

    Rarity:
    Common
    Top Symptoms:
    pain in one knee, knee stiffness, pain in the inside of the knee, knee instability, knee pain from an injury
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Knee Bruise

  • Q.Is your knee bruising getting better or worse?
  • Q.How badly bruised is your knee?
  • Q.Is your lower leg bruising getting better or worse?
  • Q.Any fever today or during the last week?

If you've answered yes to one or more of these questions, check our knee bruise symptom checker.

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Knee Bruise Symptom Checker Statistics

  • People who have experienced knee bruise have also experienced:

    • 7% Lower Leg Bruise
    • 5% Thigh Bruise
    • 5% Upper Leg Bruise
  • People who have experienced knee bruise had symptoms persist for:

    • 33% Less Than a Week
    • 26% Less Than a Day
    • 19% One to Two Weeks
  • People who have experienced knee bruise were most often matched with:

    • 2% Allergic Contact Dermatitis of the Lower Leg
    • 2% Acl Injury
    • 2% Lower Leg Weakness
  • Source: Aggregated and anonymized results from visits to the Buoy AI health assistant (check it out by clicking on “Take Quiz”).

Knee Bruise Checker

Take a quiz to find out why you’re having knee bruise.

Take a quiz