Hyperkeratosis

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Hyperkeratosis
Micrograph showing prominent hyperkeratosis in skin without atypia. H&E stain.
Pronunciation
SpecialtyDermatology Edit this on Wikidata

Hyperkeratosis is thickening of the

epidermis, or skin), often associated with the presence of an abnormal quantity of keratin,[1]
and is usually accompanied by an increase in the granular layer. As the corneum layer normally varies greatly in thickness in different sites, some experience is needed to assess minor degrees of hyperkeratosis.

It can be caused by vitamin A deficiency or chronic exposure to arsenic.

Hyperkeratosis can also be caused by B-Raf inhibitor drugs such as Vemurafenib and Dabrafenib.[2]

It can be treated with

intercellular matrix of the cells of the stratum corneum, promoting desquamation of scaly skin, eventually resulting in softening of hyperkeratotic areas.[3]

Types

Follicular

Follicular hyperkeratosis, also known as

sebum
. When called phrynoderma, the condition is associated with nutritional deficiency or malnourishment.

This condition has been shown in several small-scale studies to respond well to supplementation with vitamins and fats rich in

Ehlers-Danlos syndromes and Bethlem myopathy
.

By other specific site

Hereditary

  • Epidermolytic hyperkeratosis (also known as "Bullous congenital ichthyosiform erythroderma,"[7] "Bullous ichthyosiform erythroderma,"[8]: 482  or "bullous congenital ichthyosiform erythroderma of Brocq"[9]) is a rare skin disease in the ichthyosis family, affecting around 1 in 250,000 people. It involves the clumping of keratin filaments.[6]: 562 [10]
  • Multiple minute digitate hyperkeratosis, a rare cutaneous condition, with about half of cases being familial
  • autosomal dominant condition, characterized by oval or polygonal crateriform papules developing along the border of the hands, feet, and wrists.[8]
    : 509 
  • Keratosis pilaris appears similar to gooseflesh, is usually asymptomatic and may be treated by moisturizing the skin.[11]

Other

  • Hyperkeratosis lenticularis perstans (also known as "Flegel's disease"[7]) is a cutaneous condition characterized by rough, yellow-brown keratotic, flat-topped papules.[6]: 639 [7]

In mucous membranes

The term hyperkeratosis is often used in connection with lesions of the mucous membranes, such as leukoplakia. Because of the differences between mucous membranes and the skin (e.g., keratinizing mucosa does not have a stratum lucidum and non keratinizing mucosa does not have this layer or normally a stratum corneum or a stratum granulosum), sometimes specialized texts give slightly different definitions of hyperkeratosis in the context of mucosae. Examples are "an excessive formation of keratin (e.g., as seen in leukoplakia)"[12] and "an increase in the thickness of the keratin layer of the epithelium, or the presence of such a layer in a site where none would normally be expected."[13]

Etymology and pronunciation

The word hyperkeratosis (

Ancient Greek morphemes hyper- + kerato- + -osis
, meaning 'the condition of too much keratin'.

Hyperkeratosis in dogs

Nasodigitic hyperkeratosis in dogs may be idiopathic, secondary to an underlying disease, or due to congenital abnormalities in the normal anatomy of the nose and fingertips.

In the case of congenital anatomical abnormalities, contact between the affected area and rubbing surfaces is impaired. It is roughly the same with finger pads — in animals with an anatomical abnormality, part of the pad is not in contact with rubbing surfaces and excessive keratin deposition is formed. The idiopathic form of nasodigitic hyperkeratosis in dogs develops from unknown causes and is more common in older animals (senile form).[14][15] Of all dog breeds, Labradors, Golden Retrievers, Cocker Spaniels, Irish Terriers, Bordeaux Dogs are the most prone to hyperkeratosis.[16]

Therapy

Since the deposition of excess keratin cannot be stopped, therapy is aimed at softening and removing it. For moderate to severe cases, the affected areas should be hydrated (moisturised) with warm water or compresses for 5-10 minutes. Softening preparations are then applied once a day until the excess keratin is removed.

In dogs with severe hyperkeratosis and a significant excess of keratin, it is removed with scissors or a blade. After proper instructions, pet owners are able to perform this procedure at home, and it may be the only method of correction.[17]

See also

References

  1. ISBN 0-7216-0187-1
    .
  2. ^ Niezgoda, Anna; Niezgoda, Piotr; Czajkowski, Rafal (2015) Novel Approaches to Treatment of Advanced Melanoma: A Review of Targeted Therapy and Immunotherapy BioMed Research International
  3. ^ drugs.com > Urea Cream (Prescribing Information) Revised: 04/2010 by Stratus Pharmaceuticals
  4. PMID 7437404
    .
  5. ^ "Hyperkeratosis". Dorland's Medical Dictionary for Health Consumers. 2007.
  6. ^
    ISBN 0-7216-2921-0
    .
  7. ^
    ISBN 978-1-4160-2999-1
    .
  8. ^
    ISBN 0-07-138076-0
    .
  9. Who Named It?
  10. S2CID 31906051
    .
  11. PMID 18856156
    .
  12. ^ Mosby's Dental Dictionary
  13. ISBN 0192631470
    .
  14. ^ "Muller and Kirk's Small Animal Dermatology. Saunders, St. Luis, MO". scholar.google.com. Retrieved December 16, 2021.
  15. ^ "Skin diseases of the dog and cat: clinical and histopathologic diagnosis". scholar.google.com. Retrieved December 16, 2021.
  16. ^ "What Does it Mean When a Dog's Nose is Dry? When to Worry". boneandyarn.com. 8 August 2020. Retrieved December 16, 2021.
  17. ^ "Hyperkeratosis In Dogs: Does Your Dog Have Hairy Feet?". caninejournal.com. 7 January 2016. Retrieved December 16, 2021.

External links

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