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What Causes Unusual Large Bruises On Back Of Legs?

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Posted on Fri, 4 Sep 2015
Question: I noticed large bruises on the back of each of my legs this afternoon. I didn't injure myself and have no idea where they came from. They are tender to the touch. I have been taking Valtrex as preventative for cold sores that pop up during my period for 4 days (6 more left). I've done this for 4 months with no issue, but I do see bruising listed as side effect. Do I need to be concerned? Could it be from the Valtrex?
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Answered by Dr. Dr. Praveen Tayal (1 hour later)
Brief Answer:
You need to consult your physician.

Detailed Answer:
Hello,
Thanks for posting your query.
I have seen the image attached. The bruise that you have is not likely to be related to Valtrex. Development of large bruises on your legs spontaneously without any history of injury is suggestive of a bleeding disorder. 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.
I hope this answers your query.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Wishing you good health.
Regards.
Dr. Praveen Tayal.
For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Praveen-Tayal
Note: For further queries, consult a joint and bone specialist, an Orthopaedic surgeon. Book a Call now.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Dr. Praveen Tayal

Orthopaedic Surgeon

Practicing since :1994

Answered : 12314 Questions

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What Causes Unusual Large Bruises On Back Of Legs?

Brief Answer: You need to consult your physician. Detailed Answer: Hello, Thanks for posting your query. I have seen the image attached. The bruise that you have is not likely to be related to Valtrex. Development of large bruises on your legs spontaneously without any history of injury is suggestive of a bleeding disorder. 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. I hope this answers your query. In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out. Wishing you good health. Regards. Dr. Praveen Tayal. For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Praveen-Tayal