Overview
Athlete's foot (tinea pedis) is a common skin condition caused by a fungal (dermatophyte) infection of the foot, leading to itching, peeling, and rash. About 70% of men experience athlete's foot at some point in their lives.
It gets its name from its prevalence among athletes; however, anyone can get it. If untreated, it can spread to the nails, hands, and groin.
Symptoms
There are three main forms of athlete's foot:
1. Between-toes form (most common):
- Starts between the 4th and 5th toes
- Itching, burning
- Whitening, peeling
- Cracks, fissures
- Mild bad odor
2. Sole (moccasin) form:
- Dryness, scaling on the sole and sides of the foot
- Thickening
- Mild itching
- Cracks
3. Vesicular (blistered) form:
- Fluid-filled blisters on the sole
- Severe itching
- Burning
- Risk of secondary bacterial infection
Causes
Athlete's foot is caused by fungi called dermatophytes. The most common causes: Trichophyton rubrum, T. interdigitale, Epidermophyton floccosum.
Fungi prefer warm, moist environments. Transmission routes:
- Gym, pool, sauna, bathhouse floors (barefoot walking)
- Sharing towels or shoes
- Moist environment in socks and shoes
- Infected family members
Risk Factors
- Being male
- Excessively sweaty feet (hyperhidrosis)
- Wearing tight, non-breathable shoes
- Using synthetic socks
- Sports (especially professional)
- Using public showers
- Weakened immunity (diabetes, HIV)
- Peripheral vascular disease
- Damp toe gaps
- Excessive shoe sharing
Complications
- Nail fungus (onychomycosis): Athlete's foot can spread to the nails, with long treatment course
- Hand fungus: Hand can be affected after scratching the foot
- Jock itch (tinea cruris): Can spread to other body parts
- Bacterial infections: Cellulitis, lymphangitis
- Allergic reactions
- Severe infections in diabetics, diabetic foot
When to See a Doctor
- Cases not responding to over-the-counter medications within 2 weeks
- Diabetic or immunocompromised patients
- Severe itching, pain, pus
- Fever, redness, swelling (signs of bacterial infection)
- Color change or thickening of nails
- Rapidly spreading rash
- Frequently recurring infections
Diagnosis and Treatment
Diagnosis:
- Visual examination
- KOH preparation (skin scraping)
- Fungal culture
- Wood's lamp examination
Treatment:
Topical antifungals (first choice, 2-4 weeks):
- Terbinafine cream (Lamisil)
- Clotrimazole
- Miconazole
- Tolnaftate
- Sertaconazole
- Continue 1-2 weeks even after symptoms disappear
Oral antifungals (severe, resistant, nail involvement):
- Terbinafine
- Itraconazole
- Fluconazole
- Liver function test is required
If bacterial infection is present:
- Antibiotic (topical or oral)
Prevention
Foot hygiene:
- Wash your feet daily and dry them thoroughly (especially between toes)
- Wear clean socks every day if possible
- Prefer cotton socks
- Change your slippers often
Choice of footwear:
- Breathable, leather/canvas shoes
- Do not wear the same shoes every day (to allow drying)
- Use antifungal sprays/powders
- Avoid tight shoes
In public areas:
- Wear slippers in pool, bath, sauna, gym showers
- Do not walk barefoot
- Do not share towels, slippers, shoes
Other recommendations:
- Use antiperspirants if you sweat excessively
- Treat the whole family if a family member is affected
- Keep sweaty feet dry
- Manage diabetes