S3C15P4-1: The spotty reaction of lichen striatus at the dermal-epidermal interface is both lichenoid and spongiotic. The morphologic features of these two processes, on occasion, are difficult to distinguish, one from the other. Spongiotic reactions in the epidermis are mostly spotty in distribution. Lichenoid reactions are more diffuse and are erosive at the dermal-epidermal interface. There are perivenular extensions of the infiltrates into the reticular dermis.

S3C15P4-2: The lichenoid folliculitis of lichen striatus tends to be cell rich and mucoid in early stages. In this field, it also qualifies as follicular mucinosis, but could also be characterized as a lymphoepithelial lesion. The green arrow identifies a histiocytic, multinucleated giant cell. The process, in this field, is an expression of a T-cell reaction mediated at the level of follicular keratinocytes, particularly those of the basal unit of follicular epithelium.

S3C15P4-3: Lymphoepithelial lesions involving sweat glands are common in lichen striatus. The epithelial reaction is proliferative; it eventuates in the obliteration of the lumens of some of the affected glands.

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