Chapped skin according to Chinese Medicine
The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
Sesame oil might help with chapped skin
Why might Sesame Oil (Ma You) help with chapped skin?
Because it is a herb specifically indicated to treat chapped skin as can be seen on Sesame Oil's page.
Sesame Oil is a Cool herb that tastes Sweet. It targets the Large intestine.
Its main actions are: Moistens the Large Intestines and unblock stools. Neutralizes toxins.