We actually secrete sodium through our skin it could be that your body is secreting the excess sodium through your skin. You could also be dehydrated. You should limit your salt intake and drink more water.
You might be dehydrated. Right after my surgery I was very dehydrated for months until I learned to sip all day. Because we can't take in liquid in large amounts it's easy to forget, and difficult to get in 8 cups/day.