Lichen spinulosus typically manifests as grouped, skin-colored keratotic lesions ranging from 2 to 6 cm in size. Each individual papule measures 1 to 3 mm and has a flat to conical projection.

The etiology of lichen spinulosus is unknown and the condition may be associated with Crohn disease, Hodgkin disease, HIV, vitamin A deficiency, alcoholism, and exposure to lithium, gold, thallium ...

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