keratosis

keratosis
keratosic, keratotic /ker'euh tot"ik/, adj.
/ker'euh toh"sis/, n., pl. keratoses /-seez/. Pathol.
1. any skin disease characterized by a horny growth, as a wart.
2. any horny growth.
Also, keratoma.
[1880-85; KERAT- + -OSIS]

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      any protuberance on the skin resulting from the overdevelopment of the horny outermost covering of the skin, or epidermis, the main constituent of which is the protein keratin, which is synthesized in special cells of the skin, the keratinocytes. More generally, keratosis is any skin disorder attended by horny growths. The causes and lesions characteristic of keratotic skin disorders are varied, giving rise to some 20 different forms of keratosis; the more common ones are as follows:

      1. Palmar and plantar keratosis is a congenital, often hereditary, thickening of the horny layer of the skin of the palms and soles, sometimes with painful lesions resulting from the formation of fissures.

      2. Keratosis pilaris, also called ichthyosis follicularis, lichen pilaris, or follicular xeroderma, is a condition in which abnormal keratinization is limited to the hair follicles, manifesting itself as discrete, tiny follicular papules (solid, usually conical elevations); they are most commonly seen on the outer surface of the arms and thighs.

      3. Seborrheic keratosis is a benign skin tumour, ordinarily developing as a small yellow or brown, sharply marginated, slightly raised protuberance, covered by a thin greasy scale; these lesions result from an abnormal increase in the number of keratinocytes and seldom either undergo malignant changes or disappear spontaneously.

      4. Senile keratosis is a condition marked by sharply outlined, gray to grayish black, slightly elevated flat papules, which are generally associated with aging and exposure to sunlight. They are more frequent in sunny climates and occur on exposed areas of the body—unless ingestion of arsenic compounds has taken place in the past, in which case the lesions may appear on the palms, soles, and trunk. In some cases the lesions become cancerous, especially those on the lips and other mucous surfaces. See also wart; callus.

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Universalium. 2010.

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Look at other dictionaries:

  • Keratosis — Saltar a navegación, búsqueda La keratosis es una enfermedad de la piel que consiste en la acumulación de keratina en los folículos de los vellos de la piel. Se presenta en forma de protuberancias blancas o rojas, que a menudo son confundidas con …   Wikipedia Español

  • keratosis — [ker΄ə tō′sis] n. pl. keratoses [ker΄ə tō′sēz΄] [ModL < KERAT(O) + OSIS] 1. a horny growth of the skin, as a wart 2. any disease characterized by horny growths …   English World dictionary

  • Keratosis — Infobox Disease Name = PAGENAME Caption = DiseasesDB = ICD10 = ICD9 = ICDO = OMIM = MedlinePlus = eMedicineSubj = eMedicineTopic = MeshID = D007642 Keratosis is a growth of keratin on the skin. More specifically, it can refer to: * actinic… …   Wikipedia

  • Keratosis — A localized overgrowth of the upper layer of skin. Common forms of keratosis include aging (senile keratosis) and sun exposure (actinic keratosis). * * * Any lesion on the epidermis marked by the presence of circumscribed overgrowths of the horny …   Medical dictionary

  • keratosis — noun a skin condition marked by an overgrowth of layers of horny skin • Hypernyms: ↑skin disease, ↑disease of the skin, ↑skin disorder • Hyponyms: ↑wart, ↑verruca, ↑actinic keratosis, ↑ …   Useful english dictionary

  • keratosis — noun /ˌkɛrəˈtəʊsɪs,ˌkɛrəˈtoʊsɪs/ The condition of keratin growing on the skin. See Also: actinic keratosis, seborrheic keratosis, keratosis pilaris …   Wiktionary

  • keratosis — /kɛrəˈtoʊsəs/ (say keruh tohsuhs) noun (plural keratoses /kɛrəˈtoʊsiz/ (say keruh tohseez)) a pathological but harmless condition of the skin characterised by a horny or scaly growth, as a wart. See seborrhoeic keratosis, solar keratosis.… …  

  • Keratosis pilaris — Classification and external resources Keratosis pilaris rubra on a right upper arm. ICD 9 …   Wikipedia

  • Keratosis pharyngis — is a medical condition where keratin grows on the surface of the pharynx, that is the part of the throat at the back of the mouth. Keratin is a protein that normally occurs as the main constituent of hair and nails.One patient who was diagnosed… …   Wikipedia

  • Keratosis punctata palmaris et plantaris — Classification and external resources ICD 10 L85.2 OMIM 148600 DiseasesDB …   Wikipedia

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