How a regional fungus went global
Trichophyton rubrum, the main culprit, was once confined to parts of Southeast Asia and Africa. Most historians think colonial travel in the late 1800s and the two World Wars—soldiers in tight boots sharing communal showers—spread it worldwide. The catchy name "athlete's foot" was popularized in 1928 and turned into a marketing phrase for foot-powder ads. Oral griseofulvin arrived in 1958, and terbinafine in the 1990s transformed the treatment of toenail fungus.
Symptoms and look-alikes
The most common type affects the skin between the toes, especially the fourth and fifth, which turns white, soggy, and cracked. Others cause small blisters on the arch or sides of the foot, or a dry "moccasin" scaling across the whole sole. Eczema, dyshidrosis, and contact dermatitis can look similar, so a quick KOH test confirms it. If it spreads to the nails, they become thick, yellow, and crumbly. People with diabetes need extra care, because bacteria can enter cracks and cause cellulitis.
Treatment and keeping it away
Over-the-counter antifungals such as terbinafine (Lamisil) or clotrimazole work for skin infections—keep applying them for one to two weeks after symptoms clear, typically two to four weeks total. Stopping early is the No. 1 reason it comes back. Toenail fungus rarely responds to creams; options include several months of oral terbinafine, prescription nail solutions, or laser. Dry carefully between your toes, rotate breathable shoes, wear flip-flops in gym showers, and don't share towels. Treat everyone in the household who has it.
This article is general health information and is not a substitute for diagnosis or treatment. If symptoms persist, see a doctor.
FAQ
- Does soaking in vinegar work?
- There's no good evidence, and it can irritate the skin.
- Why does it come back every summer?
- Heat and sweat let lingering fungus flare; finishing the full course of treatment helps.
Sources reviewed: 2026-10-26
References
- Gupta, A. K., et al. (2017). Tinea pedis: An updated review. Journal of the American Podiatric Medical Association, 107(3), 228–235.
- Havlickova, B., Czaika, V. A., & Friedrich, M. (2008). Epidemiological trends in skin mycoses worldwide. Mycoses, 51(S4), 2–15.
- 대한피부과학회. 피부질환 정보: 족부백선.