Treatment of Widespread Fungal Skin Infection in Children

Diagnostic Confirmation and Treatment Overview

• The diagnosis of fungal skin infections should be confirmed with potassium hydroxide (KOH) preparation to visualize hyphae or yeast forms before initiating treatment, as the distinction between dermatophyte and Candida infections is critical for determining the appropriate treatment 1
• The American Academy of Pediatrics and dermatological guidelines recommend oral systemic antifungal therapy for widespread fungal skin infections, with the specific agent depending on the type of infection 1

Treatment for Widespread Dermatophyte Infections

• Oral terbinafine is the preferred systemic agent for widespread dermatophyte infections in children, including tinea corporis, due to its fungicidal properties and high cure rates 1
• The British Association of Dermatologists suggests griseofulvin as an effective alternative for dermatophyte infections, particularly if terbinafine is unavailable or contraindicated 2
• Itraconazole can be used at 5 mg/kg/day in children ≥2 years for dermatophyte infections, though it requires therapeutic drug monitoring (TDM) 2, 3

Treatment for Widespread Candida Skin Infections

• Topical azoles or nystatin are first-line treatments for localized-to-moderate Candida skin infections, with cure rates of 73-100% 1
• Oral fluconazole is the systemic agent of choice for extensive Candida skin infections, with dosing at 3-6 mg/kg daily 4
• The Infectious Diseases Society of America recommends fluconazole for mucosal candidiasis in all children 4

Critical Management Points

• Good personal hygiene and treatment of all family members are essential for preventing the spread of anthropophilic dermatophytes, which can affect over 50% of family members 2
• The British Association of Dermatologists advises cleansing fomites with bleach or 2% sodium hypochlorite solution to prevent reinfection 2
• Treatment should be continued until mycological cure is achieved, not just clinical improvement, to prevent relapse 2

Treatment of Fungal Skin Infections

Diagnostic Confirmation and Treatment

• Culture on Sabouraud agar with cycloheximide should be performed, with plates incubated for at least 2 weeks to identify the specific organism, and in cases with highly typical clinical features, it is reasonable to start therapy immediately while awaiting culture results, as recommended by the British Journal of Dermatology 5
• The British Journal of Dermatology recommends dosing for terbinafine in children: weight <20 kg: 62.5 mg/day; 20-40 kg: 125 mg/day; >40 kg: 250 mg/day 6
• Griseofulvin remains the only FDA-licensed product for tinea in children and is an effective alternative if terbinafine is unavailable or contraindicated, with dosing of 10 mg/kg/day and should be taken with fatty food to increase absorption and bioavailability, as suggested by the British Journal of Dermatology 5
• The Infectious Diseases Society of America is not mentioned in the context of the provided citations, however, the Clinical Microbiology and Infection journal suggests that itraconazole can be used at 5 mg/kg/day in children ≥2 years, though it requires therapeutic drug monitoring with target trough concentration ≥0.5 mg/L 7
• Topical azoles or nystatin are first-line for localized Candida skin infections, with application twice daily until clinical and mycological cure is achieved, and keeping infected areas dry is essential, as moisture promotes Candida growth, as recommended by the Clinical Infectious Diseases journal 8
• The British Journal of Dermatology also recommends that common pitfalls to avoid include not using topical therapy alone for tinea capitis or onychomycosis, as systemic therapy is required for these infections 5