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Doctor insights on: Bruise In Behind My Knee

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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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I discovered a very deep and dark purple bruise behind my knee 2 days ago...It is swollen a bit and very sore. I do not remember hitting or banging it?

I discovered a very deep and dark purple bruise behind my knee 2 days ago...It is swollen a bit and very sore. I do not remember hitting or banging it?

Post knee bruise: Not unusual to have spontaneous rupture of a posterior knee cyst,without a history of trauma. expect bruising and discomfort to resolve gradually . Avoid activities and positions that produce increased discomfort. Use ice , alleve for 7- 10 days ...Read more

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I am 45 years old with a nickel size bruise behind my knee...it is painful to touch. Area is tender but not red and slightly swollen. 6 flights recent?

I am 45 years old with a nickel size bruise behind my knee...it is painful to touch. Area is tender but not red and slightly swollen. 6 flights recent?

Please get examined.: The examination should include a careful physical examination, ultrasound, & lab tests. This should be dealt with with all haste. Please let me know the results of your evaluation. ...Read more

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I have had a dry cough for over a month now and metallic taste in my mouth after coughing. & a bruise came up behind my knee overnight. ?

I have had a dry cough for over a month now and metallic taste in my mouth after coughing. & a bruise came up behind my knee overnight. ?

Medical care: I don't know what risk factors you might have for an underlying cause, but,regardless, a cough that lasts a month or more requires evaluation. The metallic taste might be an associated symptom, especially if you have infection in your sinuses or bronchial passages. As to the bruise behind your knee, only further evaluation will reveal what's causing it. ...Read more

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I have a deep bruise behind my left knee dors not go away and does not hurt,now im noticing the same above my elbows with a rash.

I have a deep bruise behind my left knee dors not go away and does not hurt,now im noticing the same above my elbows with a rash.

Bruising: If this bruising is happening spontaneously without any injury or trauma please see your doctor as soon as you can to be examined. This could be a sign of a more serious issue. ...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 could cause bruising behind my knee 5 days after straining my mcl?

What could cause bruising behind my knee 5 days after straining my mcl?

Bleeding: When you sprain the mcl, you tear the ligament. This caused bleeding in the location of the tear. You probably elevated the knee, so the blood travelled behind your knee and collected where you see bruising. That is completely normal. It may even become sore in the bruised area because of an inflammatory response. ...Read more

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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