noun
lichen planus
Medical term for a chronic inflammatory skin condition.
扁平苔癬は皮膚や粘膜にできる炎症性の病気です。
Lichen planus is an inflammatory disease that appears on the skin and mucous membranes.
The term is composed of 扁平 (flat), 苔 (moss/lichen), and 癬 (ringworm/skin disease), reflecting the clinical appearance of the lesions. The exact historical derivation is uncertain.