Hard lump (feels like bone) under kneecap. Def not on right leg. Only left, and no pain. I exercise a lot (basketball and running). Any help on what this is? : r/AskDoctorSmeeee
Lump around the knee, what is the cause?
Hard Bump On The Knee | 9 Causes, Treatments & More
Osgood-Schlatter disease Information | Mount Sinai - New York