L66.2 Folliculitis decalvans

Name of the Condition

• Folliculitis decalvans

Summary

Folliculitis decalvans is a rare, chronic inflammatory condition that primarily affects the scalp, leading to progressive hair loss due to scarring of hair follicles. It is characterized by recurrent pustules, crusts, and eventual destruction of follicular structures, resulting in permanent alopecia. The condition may involve bacterial colonization, particularly by Staphylococcus aureus, and can persist for years with periods of remission and flare-ups.

Causes

The exact cause of folliculitis decalvans is not fully understood, but it is associated with chronic inflammation and bacterial infection, most commonly Staphylococcus aureus. The bacteria may trigger an immune response that damages hair follicles, leading to scarring. Genetic factors and impaired immune function may also contribute to susceptibility.

Risk Factors

• Chronic bacterial colonization (e.g., Staphylococcus aureus)
• Impaired immune response
• Prior scalp trauma or inflammation
• Personal or family history of similar conditions

Symptoms

• Recurrent pustules or papules on the scalp
• Crusting and scaling around hair follicles
• Progressive hair loss in affected areas
• Scarring and smooth skin in areas of hair loss
• Itching or pain in active lesions

Diagnosis

Diagnosis is based on clinical examination, including the pattern of hair loss and scalp lesions. A scalp biopsy may be performed to confirm follicular destruction and rule out other causes of scarring alopecia. Bacterial cultures can identify Staphylococcus aureus, supporting the diagnosis.

Treatment Options

Treatment typically involves long-term antibiotic therapy, often topical or oral, to target bacterial colonization. Anti-inflammatory agents, such as corticosteroids, may reduce inflammation. In some cases, isotretinoin or other immunosuppressants are used to manage severe or refractory disease. Scalp hygiene and gentle care are recommended to minimize irritation.

Prognosis and Follow-Up

Folliculitis decalvans is a chronic condition with a variable prognosis. While treatment can control symptoms and slow progression, permanent hair loss may occur. Regular follow-up with a dermatologist is important to monitor for recurrence and adjust therapy as needed. Early intervention may improve outcomes.

Complications

• Permanent scarring and irreversible hair loss
• Secondary bacterial infections
• Psychological distress due to hair loss
• Potential spread to other hair-bearing areas

Lifestyle & Prevention

• Maintain good scalp hygiene to reduce bacterial growth
• Avoid harsh chemicals or mechanical trauma to the scalp
• Use gentle hair care products to minimize irritation
• Promptly treat any scalp infections or injuries

When to Seek Professional Help

Seek medical attention if you experience persistent scalp pustules, progressive hair loss, or signs of infection (e.g., increased redness, pain, or swelling). Early evaluation can help prevent further follicular damage and guide appropriate treatment.

Tips for Medical Coders

When coding for folliculitis decalvans, use ICD-10-CM code L66.2. Ensure documentation supports the diagnosis, including clinical findings (e.g., pustules, scarring, hair loss) and any relevant bacterial culture results. Note the chronic and recurrent nature of the condition, as this may impact coding specificity and follow-up care documentation.