The emollient properties found in mayo can be beneficial to repairing the skin’s barrier function (the outermost layer of skin that defends your body against environmental threats), making it an especially helpful addition to your skincare routine if you have dry, sensitive skin or atopic dermatitis.
Besides being super hydrating, mayonnaise has the ability to act as a protective layer that sits on top of the skin and locks in moisture, while also preventing transepidermal water loss (where water passes through the skin and evaporates into the air).