Biopsy specimens from ten patients with solitary cutaneous lesions revealed the histopathologic changes of lichen planus. None of the lesions were clinically diagnosed as lichen planus. They may represent solitary lesions of lichen planus or a separate entity that cannot be distinguished on histologic grounds.
LUMPKIN LR, HELWIG EB. Solitary Lichen Planus. Arch Dermatol. 1966;93(1):54–55. doi:10.1001/archderm.1966.01600190060011
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