keratosis follicularis

keratosis /ker·a·to·sis/ (ker″ah-to´sis) pl. kerato´ses   any horny growth, such as a wart or callosity.keratot´ic

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actinic keratosis  a sharply outlined verrucous or keratotic growth, which may develop into a cutaneous horn, and may become malignant; it usually occurs in the middle-aged or elderly and is due to excessive exposure to the sun.

keratosis blennorrha´gica  keratoderma blennorrhagicum.

keratosis follicula´ris  a hereditary form marked by areas of crusting, itching, verrucous papular growths which may fuse to form papillomatous and warty malodorous growths.

inverted follicular keratosis  a benign usually solitary epithelial tumor originating in a hair follicle and occurring as a flesh-colored nodule or papule.

keratosis palma´ris et planta´ris  palmoplantar keratoderma.

keratosis pharyn´gea  that characterized by horny projections from the tonsils and the orifices of the lymph follicles in the pharyngeal walls.

keratosis pila´ris  hyperkeratosis limited to the hair follicles.

keratosis puncta´ta  a hereditary hyperkeratosis in which the lesions are localized in multiple points on the palms and soles.

seborrheic keratosis , keratosis seborrhe´ica a benign tumor of epidermal origin, marked by soft friable plaques with slight to intense pigmentation, most often on the face, trunk, and limbs.

senile keratosis , solar keratosis actinic k.

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keratosis fol·lic·u·lar·is (f-lky-lârs)

n.

A hereditary eruptive skin disorder, beginning usually in childhood, in which keratotic papules originating from the hair follicles coalesce to form crusty and warty patches. Also called Darier's disease.

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keratosis follicularis,

a group of several skin disorders characterized by keratotic papules that coalesce to form brown or black, crusted, wartlike patches. These vegetations may spread widely, ulcerate, and become covered with a purulent exudate. Treatment includes large doses of topical or oral retinoids and oral or topical corticosteroids. Also called Darier's disease.

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keratosis (ker´tō´sis),

n 1. a horny or cornified growth (e.g., wart, callosity).
n 2. a condition characterized by cornification, or hyperkeratinization, of the tissues.

keratosis, actinic,

n an overgrowth of the horny layer of the epidermis caused by excessive exposure to the sun.

keratosis blennorrhagia

(blen´rā´jē),
n a skin condition found in Reiter's syndrome characterized by pustules and crusting; once incorrectly associated with gonorrhea; more recently considered a genetic disorder occurring mostly in men between the ages of 20 and 25.

keratosis, chronic senile,

n keratosis of the lips in elderly individuals. These lesions should be considered precancerous.

keratosis, focal,

n localized areas of increased cornification (hyperkeratinization). Such lesions are seen particularly on the lips.

keratosis follicularis,

n See disease, Darier's.

keratosis, seborrheic (basal cell papilloma, verruca senilis)

(seb´rē´ik pap´lōm vroo´k sē´nilis),
n benign, pigmented, superficial epithelial tumors that clinically appear to be pasted on the skin of the trunk, arms, or face. Characterized histologically by marked hyperkeratosis, with keratin cyst formation, acanthosis of basal cells, and melanin pigmentation, all above the level of the adjacent epidermis.

keratosis, senile,

n small, firm lesions occurring principally on the face and back of the hands in elderly people or those exposed to the sun. There is hyperkeratosis with irregular and atypical proliferation of the cells of the rete Malpighi. The condition is one of premalignancy with tendency toward epidermoid carcinoma. See also leukoplakia.