| hyperkeratosis congenita | most common form of ichthyosis characterised by prominent scaling especially on the exterior surfaces of the extremities. It is inherited as an autosomal dominant trait. (12 Dec 1998) |
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| hyperkeratosis eccentrica | A rare, chronic, progressive autosomal dominant disorder seen most often in males and usually appearing in early childhood. It is characterised by the formation of slightly atrophic patches surrounded by an elevated, keratotic border. (12 Dec 1998) |
| hyperkeratosis, epidermolytic | A form of congenital ichthyosis inherited as an autosomal dominant trait and characterised by erythroderma and severe hyperkeratosis. It is manifested at birth by blisters followed by the appearance of thickened, horny, verruciform scales over the entire body, but accentuated in flexural areas. (12 Dec 1998) |
| hyperkeratosis figurata centrifuga atrophica | A rare, chronic, progressive autosomal dominant disorder seen most often in males and usually appearing in early childhood. It is characterised by the formation of slightly atrophic patches surrounded by an elevated, keratotic border. (12 Dec 1998) |
| hyperkeratosis follicularis et parafollicularis | Discrete and confluent horny follicular plugs on a crateriform base, often occurring on the arms and legs in diabetics with renal failure; possibly a severe form of perforating folliculitis. Synonym: hyperkeratosis penetrans, Kyrle's disease. (05 Mar 2000) |
| hyperkeratosis penetrans | Discrete and confluent horny follicular plugs on a crateriform base, often occurring on the arms and legs in diabetics with renal failure; possibly a severe form of perforating folliculitis. Synonym: hyperkeratosis penetrans, Kyrle's disease. (05 Mar 2000) |
| hyperkeratosis subungualis | Hyperkeratosis affecting the nailbeds of the fingers or toes. (05 Mar 2000) |
| epidermolytic hyperkeratosis | Hyperkeratosis, hypergranulosis, and reticular degeneration in the upper epidermis. Generalised epidermolytic hyperkeratosis is present in bullous congenital ichthyosiform erythroderma. Localised epidermolytic hyperkeratosis may be found in epidermal nevi and benign keratoses. Synonym: porcupine skin. (05 Mar 2000) |