Diagnosis and Management of Lichen Simplex Chronicus and Related Conditions

Diagnostic Confirmation

• A skin biopsy provides definitive histopathological confirmation of lichen simplex chronicus (LSC) and helps rule out other conditions with similar clinical presentations, according to the American Urological Association 1
• Histopathological confirmation is necessary to establish a definitive diagnosis of LSC, especially in cases with characteristic clinical features such as thickened, lichenified skin from repeated scratching 1
• The British Journal of Dermatology recommends biopsy in cases of atypical clinical presentation, diagnostic uncertainty, suspicion of malignant transformation, failure to respond to adequate treatment, or before initiating second-line therapy, to provide definitive diagnosis and rule out other conditions with similar appearance, particularly those with malignant potential 2, 3
• Biopsy is essential in cases where there are persistent areas of hyperkeratosis, erosion, erythema, or new warty/papular lesions, to exclude malignant transformation 2, 3
• A biopsy of oral lichen planus typically shows characteristic histopathological features, including hyperkeratosis, hydropic degeneration of the basal cell layer, band-like lymphocytic infiltrate, atrophic epidermis, homogenization of collagen, and apoptosis of keratinocytes (Civatte bodies) 4, 1
• The biopsy should be taken from the most active area of the lesion to ensure representative findings, according to the British Journal of Dermatology 4
• When submitting biopsy material, it is essential to provide specific information to pathologists, including clinical appearance, distribution, and patient history, to ensure good clinicopathological correlation in the diagnostic process, as recommended by the British Journal of Dermatology 4

Diagnostic Process and Follow-up

• The diagnostic process for oral lichen planus requires clinical examination, biopsy for histopathological confirmation when indicated, direct immunofluorescence (DIF) in cases where the diagnosis remains uncertain, and clinical follow-up, as recommended by the British Journal of Dermatology 2, 3
• The World Health Organization classification of oral lichen planus as a potentially malignant disorder highlights the importance of proper diagnosis and regular monitoring, with a risk of malignant transformation, emphasizing the need for regular follow-up due to the chronic nature of the disease 2, 3
• Clinicians should consider that oral lesions of lichen planus are chronic, rarely undergo spontaneous remission, and are often a source of morbidity, highlighting the need for regular follow-up and monitoring 2, 3