B35.4 Tinea corporis

Name of the Condition

• Tinea corporis
  
  • Common name(s): Ringworm of the body

Summary

Tinea corporis is a fungal infection of the skin that typically presents as a ring-like rash. It is caused by dermatophyte fungi and affects the non-hairy, smooth skin of the body, excluding the scalp, beard, hands, feet, or nails.

Causes

Tinea corporis is caused by dermatophyte fungi, most commonly Trichophyton or Microsporum species. These fungi thrive in warm, moist environments and invade the keratinized outer layer of the skin, leading to infection. Transmission often occurs through direct contact with infected individuals, animals, or contaminated objects like towels or clothing.

Risk Factors

• Close contact with infected people or animals (e.g., pets)
• 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
• Rash that may expand outward over time
• Mild to moderate itching

Diagnosis

Diagnosis typically involves a physical examination of the affected area. A skin scraping for microscopic analysis (KOH test) or fungal culture may be performed to confirm the presence of dermatophytes and identify the specific species.

Treatment Options

• Topical antifungal creams or ointments for localized infections.
• Oral antifungal medications for severe, widespread, or persistent infections.
• Keeping the affected area clean and dry to prevent further spread.

Prognosis and Follow-Up

The prognosis is generally good with appropriate treatment. Most cases resolve within 2–4 weeks with topical therapy, while oral medications may take longer. Follow-up is recommended to ensure complete resolution and to monitor for recurrence.

Complications

• Secondary bacterial infection from scratching
• Spread to other areas of the body or to others
• Persistent or recurrent infection if treatment is incomplete

Lifestyle & Prevention

• Keep skin clean and dry, especially in warm or humid conditions.
• Avoid sharing personal items like towels or clothing.
• Wear loose-fitting clothing to reduce moisture buildup.
• Wash hands thoroughly after touching infected areas or animals.
• Disinfect surfaces and objects that may be contaminated.

When to Seek Professional Help

Seek medical attention if the rash is severe, widespread, or does not improve with over-the-counter treatments. Consult a healthcare provider if symptoms worsen, spread, or are accompanied by fever or signs of infection.

Tips for Medical Coders

• Code B35.4 is specific to tinea corporis and should be used when the infection is limited to the body (excluding scalp, beard, hands, feet, or nails).
• Documentation should specify the location and extent of the infection to support coding accuracy.
• Differentiate tinea corporis from other dermatophyte infections (e.g., tinea capitis, tinea pedis) based on clinical presentation and affected areas.