I have a lump growing out of my inner right knee and it is very painfull to walk or even to stond up , what is causing this and can it be cured?

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Have it checked out by an orthopaedic doctor.

Cysts are common.

eMedicine - Cystic Lesions About the Knee : Article by David M Gonzalez

You should be aware that you should be able to touch your heel to your butt with a good knee.