Athlete’s foot doesn’t typically get worse before it gets better when you’re using the right treatment. If your symptoms are intensifying after starting an antifungal, there are a few specific reasons that could explain it, and most of them are fixable. Understanding what’s normal during healing and what signals a real problem will help you figure out whether to stay the course or change your approach.
What Normal Healing Looks Like
The earliest sign that treatment is working is that itchiness and irritation start to fade. This usually happens within the first few days of applying an over-the-counter antifungal. The skin itself often still looks rough, peeling, or red for a while longer, which can be confusing. You might feel like things aren’t improving because the visible damage lingers even after the fungus is dying off.
The key distinction: the sensation should improve before the appearance does. If the itch is calming down but your skin still looks flaky, that’s a normal healing pattern. Skin that was damaged by the fungal infection takes time to shed and regenerate. Even after your symptoms fully resolve, the fungus can still be present at low levels, which is why finishing the full course of treatment matters.
Why It Might Seem Worse After Starting Treatment
There are three main reasons your athlete’s foot could feel or look worse after you begin treating it, and they each call for different responses.
Irritation From the Antifungal Itself
Topical antifungals like clotrimazole can cause blistering, redness, swelling, itching, burning, stinging, peeling, and skin cracks as side effects. If your feet were already raw and cracked from the infection, adding a medicated cream to damaged skin can temporarily amplify discomfort. This is the most common reason people feel like things are getting worse. The reaction is to the product, not the fungus. If these symptoms are severe or if you develop hives, switching to a different antifungal formulation often solves the problem.
A Die-Off Reaction
When antifungal treatment kills a large number of fungal cells quickly, those dying cells release substances that trigger a localized inflammatory response. This is sometimes called a Herxheimer reaction. It’s well documented in systemic fungal and bacterial infections. For a surface-level skin infection like athlete’s foot, a true die-off reaction is less dramatic than what people experience with internal infections, but some temporary flare in redness or irritation in the first day or two of treatment is plausible. If this is what’s happening, it should be brief, resolving within a couple of days as the fungal load drops.
The Infection Is Still Progressing
If symptoms keep getting worse after several days of consistent treatment, the most likely explanation is that the treatment isn’t reaching the fungus effectively. This happens when application is inconsistent, when the wrong type of product is used for the type of athlete’s foot you have, or in cases of resistant fungal strains. A recent international survey found that over 90% of dermatologists across 36 countries had seen recurrent or treatment-resistant fungal infections in the preceding three years, so resistance is a growing concern.
How Long Treatment Actually Takes
One of the biggest reasons athlete’s foot seems to worsen is that people expect faster results than the biology allows. The timeline depends on the type of infection and the product you’re using.
Interdigital athlete’s foot, the kind that lives between your toes with moist, peeling skin, responds fastest. One week of terbinafine cream (sold as Lamisil) is often enough. In clinical trials comparing terbinafine to clotrimazole (sold as Lotrimin), terbinafine achieved a 93.5% cure rate at four weeks versus 73.1% for clotrimazole. By six weeks, terbinafine hit 97.2%.
The thick, scaly type that covers the sole of your foot (sometimes called moccasin-type) is slower to clear. It can take four weeks or more of daily treatment, and some cases require prescription-strength options. For clotrimazole, the standard course is four weeks of twice-daily application. If you’re only one week in and things look the same or slightly worse, you likely haven’t given it enough time.
A common mistake is stopping treatment early because symptoms improve. Partial treatment is the leading cause of relapse. The fungus can persist below the surface even when your skin feels fine, so completing the full recommended course prevents the cycle of apparent improvement followed by flare-ups that make it seem like the condition keeps getting worse.
Signs the Infection Is Truly Getting Worse
There’s a meaningful difference between temporary treatment-related irritation and an infection that’s actually spreading or becoming complicated. Athlete’s foot can develop a secondary bacterial infection, especially when the skin between your toes is cracked and macerated. Bacterial complications like cellulitis are common with untreated or poorly managed athlete’s foot.
Red flags that point to bacterial involvement rather than normal healing include:
- Spreading redness that extends beyond the original rash, especially moving up the foot or ankle
- Warmth and swelling that feel different from the original irritation
- Pus or foul smell coming from cracked skin
- Red streaks running from the foot up the leg, which can indicate the infection is spreading through the lymphatic system
- Fever or chills, which signal the infection has moved beyond the skin
These symptoms require medical attention. A bacterial infection on top of a fungal one won’t resolve with antifungal cream alone.
Getting Treatment to Work Faster
If you’re a few days into treatment and frustrated that things aren’t improving, a few practical adjustments can make a real difference. Dry your feet thoroughly after every shower, especially between the toes, since the fungus thrives in moisture. Apply the cream to clean, dry skin and extend it slightly beyond the visible edges of the rash, because the fungus often occupies a larger area than what you can see.
Wear moisture-wicking socks and change them if your feet sweat during the day. Rotate shoes so each pair gets at least 24 hours to dry out between wears. If you’ve been using clotrimazole for two full weeks without any improvement in itching or irritation, switching to terbinafine is reasonable given its higher cure rates and shorter treatment duration.
For stubborn cases that don’t respond to four to six weeks of consistent over-the-counter treatment, prescription oral antifungals are the next step. These work from the inside out and are particularly effective for the thick, scaly type that topical creams struggle to penetrate.