B35 Dermatophytosis

Name of the Condition

• Dermatophytosis
  
  • Common name(s): Ringworm

Summary

Dermatophytosis is a contagious fungal infection affecting the skin, hair, or nails. It is caused by dermatophyte fungi and is characterized by ring-like rashes, scaling, or nail changes.

Causes

Dermatophytosis is caused by fungi from the genera Trichophyton, Microsporum, and Epidermophyton. These fungi thrive in warm, moist environments and invade the keratinized tissues of the skin, hair, or nails.

Risk Factors

• Close contact with infected individuals or animals
• Sharing personal items (e.g., towels, clothing)
• Weakened immune system
• Excessive sweating
• Wearing tight or restrictive clothing
• Participation in activities with shared surfaces (e.g., locker rooms, swimming pools)

Symptoms

• Itchy, circular, red rash with clear skin in the center (ring-like)
• Scaly, cracked, or blistered skin
• Bald patches (if scalp is affected)
• Thickened, discolored, or brittle nails
• Hair loss in affected areas

Diagnosis

Diagnosis typically involves a physical examination of the affected area, skin scraping for microscopic analysis (KOH test), or fungal culture to identify the specific dermatophyte species.

Treatment Options

• Topical antifungal creams or ointments for localized infections.
• Oral antifungal medications for severe, widespread, or nail involvement.
• Keeping the affected area clean and dry to prevent fungal growth.

Prognosis and Follow-Up

With appropriate treatment, dermatophytosis typically resolves within a few weeks. Follow-up may be necessary to ensure complete clearance and prevent recurrence, especially in cases involving nails or scalp.

Complications

• Secondary bacterial infections from scratching
• Permanent nail damage or scarring
• Recurrence if environmental or behavioral risk factors persist
• Spread to other body parts or individuals

Lifestyle & Prevention

• Keep skin clean and dry, especially in folds or moist areas.
• Avoid sharing personal items (e.g., towels, combs).
• Wear breathable clothing and moisture-wicking fabrics.
• Disinfect shared surfaces (e.g., gym equipment, shower floors).
• Treat infected pets or household members to prevent reinfection.

When to Seek Professional Help

Seek medical attention if symptoms worsen, spread, or fail to improve with over-the-counter treatments, or if there are signs of secondary infection (e.g., pus, increased pain, fever).

Tips for Medical Coders

When coding for dermatophytosis (B35), document the specific site (e.g., skin, hair, nails) and any associated details (e.g., severity, treatment response) to support accurate code assignment. Ensure clinical documentation aligns with the code’s scope, as B35 is a broad category encompassing various dermatophyte infections.