Your body has both good and bad bacteria. Your skin is an important barrier between harmful bacteria (the kind that can get you sick) and the inside of your body, so showering can prevent germs from being able to come into your body (think: through your mouth, nose, and eyes). What's more, bathing can improve the ratio of your body's good bacteria (the kind that helps you digest food and generally stay healthy) versus 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 — and not showering for a week can make you even more susceptible. “We are exposed to a whole host of bacteria during our day,” says Dr. Aishah Muhammad, M.D., a pediatrician and personal trainer. “By not showering, these bugs will remain on your skin and leave you at risk of developing different types of infections, including skin and chest infections.”

When you bathe, you clean off the germs that you've encountered throughout the day, including those that can enter your body through your eyes, mouth, and nose and make you sick. However, if you do take a few days between showers, consistently washing your hands can go a long way to prevent sickness.

“By not washing, you are more likely to have a number of different bugs on your hands and face,” Dr. Muhammad says. “This puts you at risk of developing a cold or infection as bugs may be present and can leave your body fighting off their effects.”

When you aren't showering as regularly, your skin can become oily and salty — hello, sweat! — leading to blemishes and breakouts. Although your skin can get all sweaty during the day anyway, not bathing means these bacteria are not being thoroughly removed or cleaned.

“Sebum [that thin layer of oil that might make you look shiny in certain pictures] produced by the skin accumulates when you do not wash,” Dr. Muhammad says. “This, along with bacteria living on the skin, can lead to blocked pores and a breakout of spots.” Though washing your face at the beginning and end of the day can help protect your face against acne breakouts, showers help ensure that you don’t have breakouts on your body either.

A little known fact is that body odor is not caused by sweat, but actually results from the gasses bacteria give off as they consume body protein and fatty acids, according to a 2018 study published in the journal Microbiome. When you skip showering for a couple days, it can lead to your body releasing potentially unpleasant odors. Dr. Muhammad says, “Body odors form naturally as a result of bacteria on the skin breaking sweat down into acid. By not washing while continuing to sweat, bad smells will just get worse and worse.”

"For your mental health’s sake, make sure you bathe enough to keep body odor at bay," de Mello says. "According to a 2015 study on relationship deal-breakers by Peter Jonason and colleagues, smelliness ranks among the top relationship deal-breakers." Although deodorants, perfumes, and wipes can sometimes help with odors, they only mask smells that will still be there once the products wear off. Showers eliminate the odors by cleaning the bacteria entirely.

If you have skin conditions such as eczema, showering regularly can help keep flare-ups at bay. The National Eczema Organization recommends taking a shower or bath once a day to replace moisture in your skin. But do try to keep the shower on the shorter side and make sure the water's not too hot. Follow the shower by massaging your skin with moisturizer. “Dead skin and grease naturally gather on the top layer of skin,” Dr. Muhammad says. “By not washing, this buildup can leave your skin feeling itchy and dry.”

If your hair is of the oily variety, it can start to get pretty greasy after two shower-less days. For the same reason you may get breakouts after a day or two of not washing, because the oil you produce makes your hair greasy. “Sebaceous glands release an oily substance called sebum which gives your hair a natural shine; however, when an excess of sebum accumulates you can get greasy hair,” Dr. Muhammad says. “Hair naturally traps moisture against your scalp. By not washing for a number of days, grease, dirty and dead skin cells will accumulate giving you an itchy and dry scalp.”

It's uncommon, but skin issues can develop when you postpone showers indefinitely. “Dermatitis neglecta is a rare skin condition that can develop as a result of not maintaining hygiene where dead skin cells build up and cause patches on the skin,” Dr. Muhammad tells Bustle. This condition can occur when dirt accumulates on your skin because of sweat not being washed off.

It's good to be aware of the risks of dermatitis neglecta, but it's not a huge concern if you just skip the occasional shower. It really only happens when your skin is consistently not being washed correctly. But, if you have been skipping showers more often than usual and start to see brown spots on your skin, you should begin to shower more frequently and also contact your doctor to see if you need topical treatments to help eliminate the issue.