The involuting lichenoid plaque

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Abstract
• Progressive involution and subsequent regression of a plaque that showed the characteristic histologic findings of solitary lichen planus-like keratosis were observed in five patients. In each lesion, involution took place during a fourto eight-week period. In four patients, the lesion arose in a preexisting pigmented macule. Evolution into a plaque-like lesion coincided with the development of the inflammatory process. Origin from a preexisting lesion suggests that the lichenoid plaque is not an independent entity but a stage in the involution of the preexisting pigmented macule. The lichenoid inflammatory process resembles a delayed hypersensitivity reaction and seems to represent a cell-mediated rejection reaction. (Arch Dermatol1982;118:93-96)

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