L66.4 Folliculitis ulerythematosa reticulata

Name of the Condition

• Folliculitis ulerythematosa reticulata

Summary

Folliculitis ulerythematosa reticulata is a rare, chronic skin condition characterized by inflammation of hair follicles, leading to scarring and permanent hair loss. It typically presents as a reticulated (net-like) pattern of erythema (redness) and follicular papules or pustules, primarily affecting the scalp, face, or other hair-bearing areas. The condition may progress slowly and can result in irreversible scarring of affected follicles.

Causes

The exact cause of folliculitis ulerythematosa reticulata is not fully understood, but it is believed to involve an inflammatory process targeting hair follicles. This may be associated with autoimmune mechanisms, where the body’s immune system attacks follicular structures, or secondary to chronic irritation or infection. In some cases, genetic predisposition or underlying inflammatory skin conditions may contribute to its development.

Risk Factors

• Autoimmune disorders (e.g., lupus, lichen planus)
• Chronic inflammatory skin conditions
• Genetic predisposition
• Prior scalp trauma or infection
• Female gender (more commonly reported)

Symptoms

• Reticulated (net-like) pattern of erythema (redness) on the scalp or face
• Follicular papules or pustules (small bumps or pus-filled lesions)
• Progressive hair loss in affected areas
• Smooth, scar-like patches where hair has been lost
• Mild itching or discomfort in active phases

Diagnosis

Diagnosis is based on clinical evaluation, including a physical examination of the skin and hair loss pattern. A healthcare provider may perform a scalp biopsy to confirm follicular inflammation and scarring. Additional tests, such as blood work or imaging, may be used to rule out underlying autoimmune or infectious causes.

Treatment Options

Treatment focuses on reducing inflammation and preventing further follicular damage. Topical or systemic anti-inflammatory medications (e.g., corticosteroids) may be prescribed to control symptoms. In some cases, antibiotics or immunosuppressants are used to address associated infections or autoimmune activity. Hair regrowth is unlikely in scarred areas, so early intervention is critical.

Prognosis and Follow-Up

The prognosis depends on the extent of follicular damage and response to treatment. While inflammation can be managed, permanent scarring and hair loss are often irreversible. Regular follow-up with a dermatologist is recommended to monitor progression and adjust treatment as needed.

Complications

• Permanent scarring and irreversible hair loss
• Secondary infections from chronic inflammation
• Psychological impact due to visible skin changes

Lifestyle & Prevention

• Avoid harsh hair products or excessive scalp manipulation
• Protect the scalp from trauma or irritation
• Maintain good hygiene to reduce infection risk
• Follow prescribed treatment plans consistently

When to Seek Professional Help

Seek medical attention if you notice persistent redness, pustules, or hair loss, especially if symptoms worsen or spread. Early evaluation can help prevent irreversible damage.

Tips for Medical Coders

Document the clinical presentation, including the reticulated pattern of erythema and follicular involvement, to support the diagnosis. Note any associated symptoms (e.g., itching, pustules) and confirm the absence of other scarring alopecia subtypes to ensure accurate coding.