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Doctor insights on: Causes Of Bruises On The Knees

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What could have caused me to have a bruise and rash on the back of my knee?

What could have caused me to have a bruise and rash on the back of my knee?

See a dermatologist: It is difficult to make a proper diagnosis since I am not there to see the condition. I recommend seeing a dermatologist so that they can make a proper diagnosis and give you something to get rid of the condition or relieve symptoms. ...Read more

Bruise Or Contusion (Definition)

Bruises, or ecchymoses, are discolorations and tenderness of the skin or mucous membranes due to the leakage of blood from an injured blood vessel into the surrounding tissues. A serious disease called pupura presents as a cluster of small bruises called petachia. Petachia often appears as many tiny red dots clustered together, and could indicate a problem. ...Read more


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What can cause a knee cap to swell and bruise and also to have sonething hard that moves on my knee cap please help?

What can cause a knee cap to swell and bruise and also to have sonething hard that moves on my knee cap please help?

Needs eval: Bruise is usually from bleeding, which can also have swelling. Unusual place to bruise without some trauma? Knee cap is a bone and hard and moves? Can be fractured with enough trauma. Ortho is the discipline most likely to diagnose. ...Read more

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I got a knee to the thigh which caused bruising. A couple of days later I felt some discomfort on the side of my knee. Is this cause of the bruising.

I got a knee to the thigh which caused bruising. A couple of days later I felt some discomfort on the side of my knee. Is this cause of the bruising.

Bruising:knee pain: The knee to your thigh caused a contusion (bruise) but although this is the first damage one sees, other damage can be done to your knee ligaments, which heal very slowly and would be noticed a "couple days later". Blood from the bruise in your thigh can migrate down to your knee (gravity), and the swelling can also cause mild pain. ...Read more

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I have what looks like bruising/discoloration behind my knee, but it's painless. It's a brown color, not purple/blue. What could be the cause?

I have what looks like bruising/discoloration behind my knee, but it's painless. It's a brown color, not purple/blue. What could be the cause?

Ecchymosis: This pigment could be due to breakdown products of red blood cells which stain the skin brownish yellow. Perhaps a tiny capillary or vein ruptured spontaneously and painlessly in the area. This pigment usually fades away gradually over a few weeks. Your physician can advise you further if necessary. ...Read more

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What causes burst veins and bruising behind your knees?

What causes burst veins and bruising behind your knees?

Age Pressure Reflux: Varicose veins of the lower extremities can have various sources. The varicose veins are a result of pooling of blood with increased venous blood pressure. The best way to close the varicose veins can be determined on physical exam and a focus venous ultrasound examination by a physician skill in treating venous disease. Check out the american venous forum or american college of phlebology. ...Read more

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What could cause a swollen knee with bruising down to the ankle?

What could cause a swollen knee with bruising down to the ankle?

Swelling to ankle: Can be definitive for a clotting disorder such as taking Aspirin or anticoagulant drugs such as Plavix or coumadin (warfarin). Trauma or injury could also play a role. Seek medical attention especially if you have other medical problems or take medications such as steroids for something else that could make this problem worse. ...Read more

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How do I know if I have cellulitis on my knee? And does it cause bruising of the leg?

How do I know if I have cellulitis on my knee?  And does it cause bruising of the leg?

Spreading red warmth: This is typically associated with an enlarging area of redness, swelling and warmth. Occasionally one may see involvement of the lymph vessels with red streaks going up to the groin and called lymphangitis. As seen in the picture, some may circle the borders of the redness to monitor the spread into the surrounding normal tissues. ...Read more

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4 days ago i rolled an ankle and fell flat on the asphalt , I have 5 inch by 6 inch bruises below my knees. Along w/small bumps. Cause for concern?

4 days ago i rolled an ankle and fell flat on the asphalt , I have 5 inch by 6 inch bruises below my knees. Along w/small bumps. Cause for concern?

Hematoma: Most likely it's a hematoma which is a bruise under the skin. These can be uncomfortable but usually not dangerous. Watch the bumps. If they start to weep fluid i would have your leg evaluated. If very painful an x-ray for a feature is indicated. ...Read more

Dr. Melissa Gowans
2,022 doctors shared insights

Bruising (Definition)

Bruises may occur over skin that is injured. Bruising from very minor injury can be a sign ...Read more