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Hello I'm Dr Chip
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Is this painful?
Well nothing too serious here
This is bursitis--an inflammation of the bursal sac that surrounds the knee
It can just happen without any trauma
For now he can use over the counter topical capsaicin cream and take ibuprofen for it but he should have his doctor evaluate it since he may need a cortisone injection
Let me know if you need any more information
Still bursitis and oftentimes there isn't any trauma involved--it just happens
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