S.L.
You should see a doctor just to be sure the coldness isn't from circulation. Something could be pressing on something in there. I know that's a very medical sentence. Sorry. I have had that from an injury to my knee and there are exercises to do if you are sure it's okay to do them and so see a doctor first just for evaluation. I know how hard that is to get to a doctor with kids, money, etc. though. I had to wrap my knee when I first hurt it and that helped some but you need to know how to wrap it or how to wear the support.