L02.62 Furuncle of foot

Name of the Condition

• Furuncle of Foot

Summary

A furuncle of the foot is a localized, painful infection of a hair follicle and surrounding tissue, resulting in a pus-filled lesion. It typically presents as a red, swollen, and tender nodule, often with a central core of pus. This condition arises from bacterial infection and can cause discomfort, especially when walking, if left untreated.

Causes

The primary cause is a bacterial infection, most commonly Staphylococcus aureus. Infections may develop from breaks in the skin, such as cuts, abrasions, or blocked hair follicles, allowing bacteria to enter and multiply. The infection triggers inflammation, leading to pus accumulation within the affected follicle.

Risk Factors

• Poor foot hygiene or occlusive footwear
• Compromised immune system (e.g., diabetes, HIV)
• Skin conditions (e.g., athlete’s foot, eczema)
• Recent foot trauma or minor injuries
• Close contact with infected individuals

Symptoms

• Red, swollen, and painful lump on the foot
• Warmth around the affected area
• Pus-filled center (may drain spontaneously)
• Fever or chills (in severe cases)
• Swollen nearby lymph nodes

Diagnosis

Diagnosis is typically made through a physical examination by a healthcare provider, who assesses the lesion’s appearance, location, and associated symptoms. In some cases, a sample of the pus may be collected for culture to identify the causative bacteria and guide antibiotic therapy.

Treatment Options

• Warm compresses to promote drainage
• Topical or oral antibiotics (e.g., for Staphylococcus aureus)
• Incision and drainage for larger or persistent lesions
• Pain management with over-the-counter analgesics
• Keeping the area clean and dry

Prognosis and Follow-Up

With appropriate treatment, most furuncles resolve within 1–2 weeks. Follow-up may be recommended to ensure complete healing and monitor for recurrence. Severe or recurrent cases may require further evaluation to address underlying risk factors.

Complications

• Spread of infection to deeper tissues (cellulitis)
• Formation of a carbuncle (cluster of interconnected furuncles)
• Systemic infection (e.g., sepsis) in immunocompromised individuals
• Scarring or permanent skin changes

Lifestyle & Prevention

• Maintain good foot hygiene, including regular washing and drying
• Wear clean, well-fitting footwear to reduce friction
• Avoid sharing personal items (e.g., towels, shoes)
• Treat minor skin injuries promptly to prevent infection
• Manage underlying conditions like diabetes or eczema

When to Seek Professional Help

Seek medical attention if the furuncle is large, worsening, or accompanied by fever, chills, or spreading redness. Prompt care is advised for immunocompromised individuals or if home remedies fail to improve symptoms within a few days.

Tips for Medical Coders

Document the location (foot) and clinical findings (e.g., presence of pus, drainage) to support coding. Ensure the diagnosis aligns with the specific characteristics of a furuncle (single follicle infection) versus other skin abscesses. Note any contributing factors like trauma or underlying conditions for accurate coding and reimbursement.