Lichen planus pigmentosus

Lichen planus (LP) pigmentosus is a rare variant of cutaneous lichen planus (see this term) characterized by the presence of hyperpigmented lichenoid lesions in sun-exposed or flexural areas of the body.

Hyperkeratosis

Hyperkeratosis is thickening of the outer layer of the skin, the stratum corneum, which is composed of large, polyhedral, plate-like envelopes filled with keratin which are the dead cells that have migrated up from the stratum granulosum.

Total: 1

(per page)

PMID (PMCID)
20883365	FEMALE
	Diltiazem-associated photodistributed hyperpigmentation: report of two Japanese cases and published work review.
	Kubo Y, Fukumoto D, Ishigami T, Hida Y, Arase S. J Dermatol. 2010;37(9):807-11.
	Although the clinical and histological features were similar to those of lichen planus pigmentosus, the histological features did not show either compact hyperkeratosis or wedge-shaped hypergranulosis, which are typical histological features of lichen planus.