My husband has osteo arthritis in both knees. I am familiar with that. Cannot seem to figure out what is going on with Mine. Feels like I knelt on a marble or something. Burns/hurts to the touch. Thought maybe it was a bruise, but there is not a bruise. Realized last night I cannot kneel on it at all. The pain is way to much. Kind of poofy,squishy little area towards the outside on the lower part of the knee. This has been going on for a long time. Just getting worse. husband says it is not like his. Any idea's?