Histological clefts in Lichen planus are
In Lichen Planus, there is degeneration of keratinocytes of stratum basale (stratum germinativum) and disruption of anchoring elements of the epithelial basement membrane and basal keratinocytes (eg: Hemi desmosomes, filaments, fibrils). This weakens the epithelial-connective tissue interface resulting in formation of histologic clefts (i.e., Max-Joseph spaces).
Civatte bodies
Wickham's Striae
Max - Joseph spaces
Auspitz's sign