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Bruise that runs inside of the knee, soreness but not painful. What can cause it if it is not an injury?

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I just noticed a bruise on the back of my knee that runs up and down on the inside of the knee. It's about 4 inches long, it is a little sore, but not painful. I have not injured that area, so I don't know what caused it.
Posted Tue, 22 May 2012 in General Health
Answered by Dr. Rakhi Tayal 2 hours later
Thanks for posting your query.
Development of large purple bruises on back of your knee spontaneously without any history of injury is suggestive of a bleeding disorder. In some cases, prolonged intake of drugs like aspirin can also cause this.
You need to consult your physician to get a complete blood coagulation profile checked with APTT and platelet count to rule out other possible causes like thrombocytopenia.
This can also happen due to a viral infection in the recent past- decreases the synthesis of platelets from the bone marrow.
Presence of any autoimmune disorders also needs to be ruled out.
The treatment is based on the diagnosis and severity of the problem. Treatment is usually done by stopping aspirin, fluid infusion, steroids, immunoglobulins, blood transfusions, etc according to the severity of the condition.

Hope this answers your query. I will be glad to answer the follow up queries that you have.
Please accept my answer in case you do not have further queries.
Wishing you good health.
Dr. Rakhi Tayal.
Above answer was peer-reviewed by
Follow-up: Bruise that runs inside of the knee, soreness but not painful. What can cause it if it is not an injury? 4 hours later
I recently began taking 7-Keto, 100mg Thursday and 100mg this morning, could that have caused it? Otherwise, I have been taking nothing listed above.
Answered by Dr. Rakhi Tayal 2 hours later

Thanks for writing again.
7-Keto is not likely to cause the spontaneous appearance of bruise that you are having.
I would suggest that you undergo a complete blood workup including a platelet count, bleeding time , aPTT . Also, a complete physical check up by your physician would prove useful
Hope this answer is helpful.

Do accept the answer in case there are no further queries.

Above answer was peer-reviewed by
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