I just started riding after taking the winter off. Three rides to date, one 20 miles one moderate hill; second 25 miles, a few hills; third 17 miles just one hill. Two days later my right knee started to feel like it was filled with mollasis. Three days later I have a lump on my knee. It is on the lower right hand side, and comes into play when I bend my knee completely. I know I have to see a doctor, but has anyone else had this problem?