I was born with Hemangioma birthmark that cover my right knee. From middle of cafe to the top of knee. Causes pain, immobility, numbness. Please help?

Hemangioma. I advise consulting an Orthopedic specialist to determine intervention, whether conservative or surgical.
Hemangioma. I am sorry to hear of how this is impacting you. Unfortunately, this is an issue that we really can't help you with from afar. I would encourage in -person medical assessment to determine possible treatment options. Take care.