The top of my left foot is numb but does not hurt. it appears to be very slightly swollen but i don't nitice the numbness until i take off my socks.

Mild neuropathy: Commonest cause is vitamin b deficiency from consumption of sugar.

Foot numbness : A detailed history and physical examination will help your physician establish the correct diagnosis and treatment. Your physician may determine if close observation is enough for now. List of possibilities is extensive and include trauma, insect bites, nerve injury from crossing legs, or blood vessel problem. Check with your primary doctor. A podiatrist evaluation may be an alternative.

Anatomy: If numb over top of foot suggests either peroneal neuropathy or l-5 radiculopathy. Maybe mild now, but see your doctor and evaluate if this is the start of a systemic process such as diabetes.

Go with the flow.: It sounds like you've managed to slow down the venous return. The blood can flow down to your foot but pressure on the top of the foot has impeded the blood returning up your leg by smashing the veins. of course , it could involve other possibilities. To remove all doubt, have your foot examined, especially if the condition persists.