I have a burning sensation in my quads when i put the laptop or any thing on it and it burning gradualy untill it's painfull what could be the cause?

EMFs: Exposure to electromagnetic field with laptop use can cause pain and bruising. It is best to keep your laptop on a table. If after doing this for a few weeks you still get burning when you place something on your lap then definitely see a doctor for neuralgia.

?meralgia: A not so unusual situation might involve compression of lateral femoral cutaneous nerve of the thigh, causing a burning and numbing sensation over the anterolateral area of the thigh. However, a little unusual to be present bilaterally. Also, might wonder about lumbar stenosis and spinal compression upon changing posture. An EMG may be needed to pin down fully.