Instead of slicing the skin off your cucumber, leave it on, as it is perfectly safe to eat. While pesticides can be found on the skin, they can easily be washed off.
Cucumbers also have a natural wax on their skin. By getting organic cucumbers and washing them before consumption, you can ensure you're only getting the good stuff.
Cucumber skin holds vitamins A, C, K, multiple types of B, and lots of mineral content. It contains essential minerals like potassium, magnesium, calcium, iron, zinc, and selenium.