When a bad odor appears or an area of skin becomes problematic, the most common reaction is to switch to an antibacterial cleanser and use it every day. It seems logical at first: if odor comes from bacterial activity on the skin, reducing the bacteria seems like the solution.
In dermocosmetics literature, however, two recommendations coexist that pull in opposite directions. On the one hand, antiseptic gels or soaps are recommended in cases of excessive sweating. On the other, it is pointed out that the skin’s saprophytic microbiota is very vulnerable and that excessive or harsh cleansing can reduce it to the point of leaving room for pathogenic germs.
The two statements aren’t contradictory if you add the variable that’s usually missing: duration. L'antiseptic is a tool for a specific situation, not an indefinite daily habit.
Article written by Elisa Avalle, founder of LeLang Skin Care and dermocosmetics specialist. Cover image generated with the support of artificial intelligence.
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What an antibacterial cleanser does
An antiseptic cleanser does more than remove dirt: it reduces the microbial load on the skin’s surface. That’s exactly what it promises and, in some situations, it’s what’s needed.
The limitation is that it doesn’t target selectively. It reduces the bacteria involved in a problem along with the resident bacteria that normally keep that problem in check. A stable microbial population lives on the skin and helps defend its surface: if it is continually depleted, the space left behind doesn’t stay empty. The role of this flora is described in the guide to the skin microbiome.
Why daily use is the problem, not the ingredient
The chain of reasoning “odor, therefore bacteria, therefore antibacterial” shifts the goal without you realizing it: from controlling the problem to sterilizing the surface.
In practice, someone who comes in with reactive skin has almost always already increased how often they wash and chosen a harsh cleanser. Adding a daily antiseptic means pushing further in the direction that caused the problem.
It's also worth remembering that sweat is odorless or nearly so. Lthe odor comes from skin flora transforming secretions, and underarm secretions, which are richer and have a basic pH, fuel the process. Increasing the number of washes affects the last link in the chain, and only for a few hours.
When antiseptics make sense
It's not a product to rule out. It makes sense when there's a specific reason, and for as long as that reason exists: a limited situation, a defined period, a verifiable goal.
What doesn't work is using it as a daily habit over the entire body, indefinitely, especially on already reactive skin. That's the difference between using a tool and doing something automatically.
What works better instead
For sensitive skin, the most effective approach is not antibacterial power, but the variables that determine how much washing affects the skin barrier: water temperature, contact time, and type of surfactant.
- A gentle synthetic cleanser with a pH of around 6-6.5, known in Italy as soap-free soap, is the right starting point.
- If the skin is particularly reactive, take things down a notch: use shower oil, thermal or demineralized water, and avoid alkaline soaps and strong fragrances.
- Let the skin dry by patting, not rubbing, paying special attention to the folds, where residual moisture can cause maceration and irritation.
- Clothing that touches the area should be changed daily, and it is best to choose loose-fitting, breathable garments.
For a complete overview of cleansing mechanisms, see the guide to skin cleansing, and for the classification of surfactants, see the article on surfactants in cosmetics.
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One detail that changes the result
If using a product specifically for the underarm area, apply it to perfectly dry skin: this is essential for adhesion and for keeping the active ingredients localized. Do not apply it to irritated or damaged skin, or immediately after hair removal.
The frequency recommended by the manufacturer should also be followed in both directions. Excessive use increases the risk of redness, itching, and burning; too little product or using it too infrequently compromises the results and can lead you to conclude that the product doesn’t work.
Where cosmetic advice ends
There’s one limit worth keeping in mind. If there are lesions, maceration in skin folds, folliculitis, or redness that doesn’t go away, the question is no longer which cleanser to use: you need an assessment by a doctor or dermatologist, who can identify the cause and recommend a course of action.
The same applies to sweating that appears suddenly, affects multiple areas of the body, or occurs even at rest and during the night. Hygiene products have a clear, limited goal: to remove dirt while preserving the skin barrier. They are not a treatment.
At LeLang partner pharmacies, when someone asks, “I need something antibacterial,” the first thing we look at is the skin’s condition and the routine they’re already following: a shelf can’t make that distinction, but a person can. Find your nearest pharmacy here.
Have you been using an antibacterial cleanser for months without seeing any improvement in your skin?
In a free virtual consultation, we’ll review your cleansing routine and work out which factor is keeping the problem going.
On the website: Sensitive Skin · Body Skincare · Facial Cleansers
Frequently asked questions
What does an antibacterial cleanser do?
In addition to removing dirt, it reduces the microbial load on the skin’s surface. Its limitation is that it isn’t selective: it reduces bacteria involved in a problem along with resident bacteria, which help protect the skin. If this flora is continually depleted, the space left behind won’t stay empty and may be occupied by pathogenic germs.
Can you use an antibacterial cleanser every day?
Using it daily on the whole body with no end date is not recommended, especially for already reactive skin. The skin microbiota is vulnerable, and excessive or aggressive hygiene can reduce it too much. L' antiseptic makes sense in a specific situation, for a defined period, and with a verifiable goal: it is a tool, not an automatic routine.
Does an antibacterial cleanser help with body odor?
It only works for a few hours. Sweat itself is odorless or nearly so: odor develops when skin flora transforms secretions, especially the richer, alkaline-pH secretion from the armpits. Increasing the number of washes or switching to an antiseptic addresses the final link in this chain, while risking damage to the skin barrier if the skin is sensitive.
What should you use instead of an antibacterial cleanser if you have sensitive skin?
Washing habits matter more than antibacterial strength. Start with a gentle synthetic detergent with a pH of around 6-6.5, a soap-free cleanser. If the skin is very reactive, switch to a shower oil, using thermal or demineralized water, with no alkaline soaps or strong fragrances. Pat dry, taking care to dry the folds, and change clothing that comes into contact with the area every day.
When should you see a doctor instead of trying a new cleanser?
If there are lesions, maceration in the folds, folliculitis, or redness that does not go away, choosing a cleanser is no longer the issue: a doctor or dermatologist needs to assess the situation. The same applies to sweating that appears suddenly, affects multiple areas of the body, or occurs even at rest and at night. Hygiene products cleanse while respecting the skin barrier; they are not a treatment.
Sources for this article
- Del Pozo A. Body hygiene. Fundació IL3 – University of Barcelona, 2023.
- Del Pozo A. Body odor. Deodorants and antiperspirants. Fundació IL3 – University of Barcelona, 2023.
- Del Pozo A. Sensitive skin: criteria for selecting vehicles. National Dermopharmacy Conference, Bilbao, 2005.
- Regulation (EC) No 1223/2009 of the European Parliament and of the Council on cosmetic products.
Elisa Avalle is the founder of LeLang Skin Care, specializing in dermocosmetics at the University of Barcelona.
