Lichen Planus

Which of the following histopathological findings is MOST characteristic of lichen planus?

A patient presents with the oral lesion shown in the image. The white, lacy, reticular pattern on the buccal mucosa is characteristic of which of the following conditions?

A 52-year-old woman presents with painful erosions on the buccal mucosa and a reticular pattern of lesions on her wrists and forearms. Clinical examination reveals violaceous, flat-topped papules with Wickham's striae. Which investigation is most appropriate to confirm the diagnosis of lichen planus?

A 52-year-old woman presents with painful erosions on the buccal mucosa and a reticular rash on her wrists and forearms. Biopsy confirms lichen planus. What is the first-line topical treatment for her oral lesions?

A 48-year-old man with a 6-month history of violaceous, pruritic papules on his flexural surfaces and oral mucosa is suspected to have lichen planus. The clinical diagnosis is uncertain. Which investigation would provide the most specific histological confirmation?