Patient :The doctor said I have a small bone defect where my knee has a small bump (Smaller than a pea) and my knee hurts if i do physical activity. Today I just noticed I have a ping pong sized lump behind my knee right underneath the spot where I bend it. it is purple and doesn't hurt. What is it? Is it normal or ? (It is on the leg that hurts sometimes)
Symptoms: Knee pain when used too much, weak knee,
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