Lichenoid
Pronunciation: LY-ken-oyd
Describing a histopathological pattern or clinical morphology resembling lichen planus, characterised by band-like lymphocytic infiltration at the dermoepidermal junction.
Full Definition
The term 'lichenoid' is an adjective used clinically and histopathologically to denote features resembling those of lichen planus. Histologically, a lichenoid reaction pattern is defined by a dense band-like infiltrate of lymphocytes hugging the dermoepidermal junction, accompanied by vacuolar alteration and colloid body formation. Clinically, 'lichenoid' describes flat-topped violaceous papules or plaques that may be drug-induced, graft-versus-host related, or idiopathic. Editors should note this is a descriptive modifier, not a standalone diagnosis, and must not be used interchangeably with 'lichen planus.' The adjectival form is always 'lichenoid' (not 'lichenous' or 'licheniform').
Usage
Usage note: Always use 'lichenoid' as an adjective, not a noun; do not conflate with 'lichenification,' which describes epidermal thickening from chronic scratching.
In Context
- "Histopathology revealed a lichenoid infiltrate at the dermoepidermal junction, consistent with a drug reaction." — Dermatopathology report
- "The author incorrectly wrote 'lichenous eruption'; the editor corrected this to 'lichenoid eruption.'" — Journal manuscript editing note