Given that it's on the surface of the knee, perhaps it's related to circulation? Do you have any problems with arthritis or issues INSIDE the knee joint?

i received physio last year for a relaxed muscle around my knee cap, other than that nothing elso wrong with my knee. when the cold sensation comes on, and that is almost every 20 minutes or so, my knee is actually cold to touch.

IS the cold uncomfortable or just weird? Are you looking to diagnose the condition? If so, I'd suggest that you first see an orthopedist, who can refer you to the correct specialist...I'm not sure if you'll need to see a neurologist or a GP or what. It's quite baffling, actually.

i'm actually phoning for a Gp appointment tomorrow. My knee is quite stiff in the morning but not sore. i'm too am baffled. it is getting to the annoying stage as I feel i am permanently walking about with a wet patch on my knee cap. does that make any sense. thank you for replying and trying to help. it's much appreciated.

Sounds good --- please let us know the diagnosis...maybe there is fluid in the kneecap? Your experience could help others!