Feather7, I'm worried. Did you only use an app for this? Legs and feet swollen could indicate heart failure, the keeping of the fluid. Have you notice something else? If you have hair on your legs are there less so or non at all? Do you have pain in your legs? More stiff? Then it can mean it is arterial insufficiency. What ever it can be you need to consult a real doctor, I would not trust that app thing. It can only be coincidental you got the reaction through the socks, to me it does not explain the swollen. I'm hoping I am over reacting, of course.