Cucumber, known as cucumis sativus, is a widely cultivated and consumed vegetable that's commonly used in skincare products including creams, lotions, toners and facial masks, to hydrate and soothe skin. It's also found in eye creams and gels, where its natural coolness can reduce puffiness and alleviate tired eyes. Cucumber can also be included in sunburn relief products to provide relief to sun-damaged skin.