My knees hurt, but in a strange way?

3 weeks ago I stood on my knees for roughly 20 minutes trying to fix my computer (i should own sit contained by the chair) and the subsequent light of day my knees burn. It have be 3 weeks and still impossible to tell apart. They ONLY time it burns when i'm on my knees after i try to carry final up and as i win rear legs up my knees BARELY grind the mat and it burns really bad---feels exactly resembling a runner burn, but my knees solitary grate the hearth rug ONCE. I look at my knees and they look without fault commonplace and I can run, hike doesn`t matter what and not discern anything. I tried putting lotions and such but it is still indistinguishable. I'm contained by my untimely 20's at don't hold problems.
what can this be?

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Answers:    I would recommend checking out the symptom checker at webmd.com

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dont progress on your knees
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