Neurodermatitis (Lichen Simplex Chronicus): Causes, Symptoms, and Treatment

What Is Neurodermatitis?

Neurodermatitis (lichen simplex chronicus) is a chronic, localized eczema characterized by lichenification (thickened, leathery skin with exaggerated markings) resulting from repetitive scratching/rubbing driven by intense pruritus.

Pathophysiology

• Itch-scratch cycle: Initial pruritus → scratching → nerve ending sensitization → more itch → more scratching.
• Neuroimmune dysregulation: ↑IL-31, NGF, substance P; central sensitization.
• Triggers: Stress, anxiety, dry skin, irritants, insect bites, underlying eczema/psoriasis.

Clinical Features

• Single or few plaques (nape of neck, scalp, wrists, ankles, genitalia, anus).
• Well-demarcated, hyperpigmented, lichenified, excoriated.
• Intense paroxysmal itch, worse at night/stress.

Diagnosis

Clinical; biopsy if atypical (shows hyperkeratosis, acanthosis, dermal fibrosis, vertical streaking of collagen).

Treatment (Multimodal)

1. Break the cycle: Occlusive dressing (Unna boot), night gloves, behavioral strategies.
2. Topical: High-potency corticosteroids (clobetasol) × 2–4 wks → taper; calcineurin inhibitors (tacrolimus) for maintenance/face.
3. Intralesional steroids: Triamcinolone for thick plaques.
4. Systemic: Antihistamines (sedating at night), gabapentin/pregabalin (neuropathic itch), short-course oral steroids.
5. Phototherapy: NB-UVB for widespread/resistant.
6. Psychologic: CBT, habit reversal, stress management.
7. Moisturizers: Ceramide-based, frequent.

Prognosis

Chronic, relapsing. Long-term control requires addressing both skin barrier and neural/psychological drivers.