Yes and also red rash related to dry skin ; blood vessels and scorisis appear.
Pressure decreases
Boiling. A liquid boils at a temperature at which its vapor pressure is equal to the pressure of the gas above it.
It's called my "ankles".
As altitude above seal level increases, atmospheric pressure decreases.
Air pressure is simply the weight of the air above you. Air pressure falls with height because the higher you go up, the less air there is above you to weigh down on you.
You aren't at water level.
The air is thinner the higher you go.
The air is thinner the higher you go.
The most likely causes are either that your shoes are too tight, or the friction between your shoes and your ankles are causing irritation.
The deeper you swim, the greater pressure becomes because there is more water above you pressing down.
From Bernoulli's theorem this results in the air above the wing to form a low pressure compared to the air beneath the wing. High pressure moves to low pressure so you get lift
Air pressure is always greater nearer the earth surface than at altitude due to the mass of air above.