Stiff Neck And Lump In Neck I've Had A Stiff Neck W/pain & Aclicking Under My Shoulder Blades For A Yr What Could It Be?

I've had a stiff neck w/pain & aclicking under my shoulder blades for a yr what could it be? - stiff neck and lump in neck

Pain in the neck, the neck, shot to the left ear and temple over a bump under his left arm between the arm and shoulder.