What Everyone Should Know About Tinea in Kids & Teens
Why Summer Is Prime Season for Fungal Infections
When the temperature rises, so does the risk of infection. Heat, sweat, occlusive footwear, communal swimming pools, locker rooms, and shared towels create the perfect storm for dermatophyte infections in children and adolescents. I’ve noticed a predictable spike in tinea pedis (athlete’s foot) and tinea cruris (jock itch) every single summer.
Tinea Pedis aka “Athlete’s Foot” in Kids
- Scaling, peeling, or maceration between the toes (especially the 3rd–4th web space)
- Itching, burning, or a “wet sock” feeling
- In younger children: may present as vesicles (blisters) on the sole, often misdiagnosed as eczema
Tinea pedis in pre-pubertal children is less common than in teens, but it does happen, especially in kids who frequent public pools or wear tight, non-breathable sneakers all day. Don’t dismiss scaling feet in a 7-year-old as just “dry skin.”
Common culprits: Trichophyton rubrum, T. mentagrophytes, Epidermophyton floccosum
Tinea Cruris Aka “Jock Itch” in Teens
- Well-demarcated, red-brown, scaly plaque in the groin/inner thigh
- Spares the scrotum (unlike candidiasis, an important clinical distinguisher
) - Often bilateral, with a raised advancing edge
- Itching that worsens with heat and activity
Higher risk
- Adolescent boys are predominantly affected
- teen girls in tight athletic wear.
- Obesity and excessive sweating.
Proactively ask about groin symptoms in teenagers presenting with foot fungus, because co-infection of foot + groin is extremely common. Treat both, or you’ll see recurrence. 
Treatments
Tinea Pedis (mild): Topical clotrimazole, terbinafine, or miconazole, 2–4 weeks
Tinea Pedis (hyperkeratotic/extensive): Oral terbinafine or fluconazole, 2–6 weeks
Tinea Cruris: Topical azole or allylamine, 2–3 weeks
Recurrent/Widespread: Consider oral therapy + rule out immunodeficiency
Clinical pearl: Topical steroids often mistakenly applied for “rash” can mask and worsen tinea, creating tinea incognito. Always consider fungal etiology before reaching for the steroid tube.
Prevention Tips
Breathable footwear: mesh sneakers > rubber-soled clogs in summe
Moisture-wicking socks: change after sports; never re-wear sweaty socks
Flip flops in communal areas: pools, gyms, locker rooms, camp showers
Dry between toes thoroughly after bathing
No shared towels, socks, or shoes: even among siblings
Loose, breathable underwear: cotton over synthetic for groin health
Wash athletic wear after every use
A Note to Fellow Physicians
- KOH prep remains your fastest, most cost-effective tool for confirmation in-office.
- In children under 2 years with “diaper area rash” not responding to typical treatment, think Candida over dermatophytes (different management entirely).
- Tinea pedis → tinea unguium (nail) pipeline is real in teens. Check the nails if the foot is positive.
- Always check for tinea capitis in younger children presenting with any tinea it requires systemic treatment and is commonly missed.
This post is intended for educational purposes for both patients and healthcare providers. Clinical decisions should always be individualized after consulting a specialist.
MBH/PS