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What Causes Large Bruising On Knee With Pale Spots In The Middle?

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Posted on Fri, 9 Jan 2015
Question: My 9-year-old son has a large bruise on his knee, with two pale spots in the middle, and smaller red spots as well. It doesn't hurt and he doesn't remember hitting his knee. I bruise easily, and he is worried about it.

What could this be?
He is also dizzy/lightheaded.
doctor
Answered by Dr. Diptanshu Das (1 hour later)
Brief Answer:
Certain investigations required

Detailed Answer:
Thanks for asking on HealthcareMagic.

Bruising on the knees can be a normal feature in case of an active 9 year old. But other causes of reduced coagulability like low platelet count, platelet disorders, clotting factor deficiencies etc. need to be ruled out. Other causes could be vitamin C deficiency or collagen vascular diseases.

Therefore without undue concern, initially I would insist on getting his complete blood count along with platelet count done. The next thing would be Prothrombin time and activated partial thromboplastin time (PT, INR and aPTT). Based on the reports, we can arrive at a conclusions.

Please get the investigations done. His treating doctor will know about these tests. You might upload the results so that I can comment better.

Wish you for a quick resolution of problems. Wish you and your family health.

Regards
Note: For further queries related to your child health, Talk to a Pediatrician. Click here to Book a Consultation.

Above answer was peer-reviewed by : Dr. Prasad
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Answered by
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Dr. Diptanshu Das

Pediatrician

Practicing since :2005

Answered : 3875 Questions

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What Causes Large Bruising On Knee With Pale Spots In The Middle?

Brief Answer: Certain investigations required Detailed Answer: Thanks for asking on HealthcareMagic. Bruising on the knees can be a normal feature in case of an active 9 year old. But other causes of reduced coagulability like low platelet count, platelet disorders, clotting factor deficiencies etc. need to be ruled out. Other causes could be vitamin C deficiency or collagen vascular diseases. Therefore without undue concern, initially I would insist on getting his complete blood count along with platelet count done. The next thing would be Prothrombin time and activated partial thromboplastin time (PT, INR and aPTT). Based on the reports, we can arrive at a conclusions. Please get the investigations done. His treating doctor will know about these tests. You might upload the results so that I can comment better. Wish you for a quick resolution of problems. Wish you and your family health. Regards