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Women are primarily affected by lichen planus, a chronic autoimmune skin and mucosal disorder in their 40s to 60s. Medication, systemic disorders, and mental stress are some of the factors that can cause it, though the precise cause is still unknown. Middle-aged females are the main victims of the disease; children are rarely affected.

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Background: Immune checkpoint inhibitors (ICIs) have revolutionized cancer treatment, yet they can induce immune-related adverse events (irAEs), including cutaneous toxicities such as lichenoid eruptions. Pembrolizumab, a PD-1 inhibitor, is known for its association with lichen-planus-like reactions, while the side effect profile of combining immunotherapy with MK-4830, a novel fully human IgG4 monoclonal antibody that targets ILT-4, remains limited.

Case Report: We present a case of a 47-year-old female with metastatic breast cancer who developed a grade 2 Common Terminology Criteria for Adverse Events (CTCAE) lichenoid reaction after 9 months of MK-4830 and pembrolizumab use.

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Actinic Lichen Planus: Significance of Dermoscopic Assessment.

Cureus

March 2023

Dermatology, Venereology and Leprosy, Jawaharlal Nehru Medical College, Datta Meghe Institute of Higher Education and Research, Wardha, IND.

Article Synopsis
  • - Actinic lichen planus (LP) is a rare variant of lichen planus, a chronic inflammatory skin condition affecting 1-2% of the population, typically presenting as pruritic, purplish, polygonal papules.
  • - In actinic LP, lesions appear in sun-exposed areas like the face and hands, with the absence of Koebner's phenomenon, and may be confused with conditions such as discoid lupus erythematosus and granuloma annulare.
  • - Dermoscopy is a valuable, non-invasive tool for diagnosis, revealing features like "Wickham's striae," and treatment generally involves corticosteroids; a case study describes a 50-year-old woman whose
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A 44-year-old woman presented with mildly itchy, brownish-black plaques for the last 2 years. The lesions first appeared on the upper back, followed by involvement of the face and upper arms within 4-5 months. Individual lesions began as small papules that gradually evolved into small, annular, and barely palpable plaques.

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Lichen planus is a chronic inflammatory cutaneous and mucosal disease mostly affecting middle-aged individuals. The etiology of lichen planus is unknown, but current literature suggests that it is an altered immune response characterized by dysregulated T-cell activation and subsequent inflammation which can be associated with conditions like allergic contact dermatitis and hepatitis C. Additionally, heavy metals like lead, tin, arsenic, and bismuth can create inflammatory and allergic reactions that can predispose to the formation of lichen planus.

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