In my previous post about how to identify sensitive skin, I mentioned that only 10% of the entire world's population truly has dry skin. The rest who experience dryness actually have dehydrated skin.
Truly dry skin lacks oil and has less natural ability to keep water within the skin. The skin uses oil to lubricate itself and to keep water from escaping. Because pores expand to accommodate a larger oil flow, the indicator of truly dry skin is very small pores. Dry skin is typically thin, delicate, and can sometimes become slightly congested due to a lack of momentum of oil. In this case, not enough oil is produced to push out of the pores, which can result in some oil becoming stuck and solidifying by mixing with dead skin cells. However, with truly dry skin this is actually not very common.