Skipping your shower could lead to an excess of dead skin cell buildup, says Amy Wechsler, a New York City dermatologist. Hyperkeratosis, which is the thickening of the outer layer of the skin, would undoubtedly occur. Rashes and itchy irritation will occur.

You can't contain the bad bacteria if you don't shower," the site explains. "And if they find their way to your eyes, nose, or mouth, you can get sick." Bacteria is also the cause of body odour. In fact, the gasses given off by bacteria can reportedly lead to around 30 nasty smells from one body.Oct 7, 2016
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This is what happens if you don't shower for two days - Cosmopolitan

You Can't Contain Bad Bacteria
So, when you skip that shower, you're letting a day go by where your body is not strengthening your skin's good bacteria, making it more susceptible to harmful bacteria. When you go yet another day without bathing, it only adds to your chances of being vulnerable to bad bacteria.

Not showering will do more than just make you smell. It can cause illness from bad bacteria and make your skin breakout. ... Unless you're camping in the backcountry, you probably shower regularly. When on the road, where running water is scarce and habits are thrown for a loop, that bathing ritual could disappear.