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On Sunday, I did a muddy boggy 5 miler round Dartmoor. This afternoon, I noticed the back of my right knee was sore and when I looked at it, I've got a bright red spot in the crease where my hamstrings go. Now it's hot to touch and quite firm, like there's a lump below my knee joint. The redness looks like it's tracking both above and below the main spot. Is it likely I was bitten by something on Sunday?
I've got something similar on the inside edge of my left knee which looks like a blister, again with redness around it, but it's not as large or painful as the one on the right.
Does anyone have any suggestions? I'm at hospital tomorrow for pre op checks before an operation next week and don't want to have to postpone it.