A rare, benign, epidermal disease characterized by a solitary, asymptomatic, verrucous, skin-coloured to red-brown papule or nodule, which contains a central pore and keratotic plug, occuring most frequently on the scalp, face and neck (rarely, in the mouth, under the nail plate or on the mons pubis). Occasionally, lesions may be multiple and/or pruritic. Histologically, a well-circumscribed, cup-shaped, keratin-filled invagination, with prominent acantholytic dyskeratosis, suprabasilar clefts and villi projecting into the clefts, is observed.
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.
Comedonal, cornifying and hypertrophic Darier's disease in the same patient: a Darier combination.
Aliagaoglu C, Atasoy M, Anadolu R, Ismail Engin R. J Dermatol. 2006;33(7):477-80.
In addition to the classic histopathology of DD, we noted multiple, warty dyskeratoma-like structures in the comedonal type, marked compact hyperkeratosis in the cornifying type, and marked papillomatosis in the hypertrophic type.
