Now that it's no longer swollen I see that there is a little scar there, probably from one of my many crash-and-burns. It's on the side of the patella, where the seam runs up toward the outside of the leg. I will try the cover roll next time.

Also, for the record, I'm finding that the floating gusset chafes like crazy after about 3.5-4 hours. I think I'm going to cut it out. I have some older knickers that don't have this and they are much more comfy!