any horny growth, such as a wart or callosity.
a sharply outlined wartlike 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. Called also senile
or solar keratosis
. (See Atlas 3, Part F).
a slowly progressive autosomal dominant disorder of keratinization
characterized by pinkish to tan or skin-colored papules on the seborrheic areas of the body that coalesce to form plaques, which may become crusted and secondarily infected; over time, the lesions may become darker and may fuse to form papillomatous and warty malodorous growths. Called also Darier's disease and Darier-White disease.
keratosis pharyn´gea horny projections from the tonsils and pharyngeal walls. Called also pharyngokeratosis.
a hereditary hyperkeratosis
in which the lesions are localized in multiple points on the palms and soles.
seborrheic keratosis (keratosis seborrhe´ica) a benign, noninvasive tumor of epidermal origin, marked by numerous yellow or brown, sharply marginated, oval, raised lesions.
keratosis (ker?a-to'sis) (-to'sez?) plural.keratoses [ kerato- + -osis]
1. Growth of the horny layer of the skin; a callus, callosity, or keratoma.
2. Any condition of the skin characterized by the formation of horny growths or excessive development of the horny growth. keratotic (?a-tot'ik), adjective Synonym: keratoma
ACTINIC KERATOSIS: Actinic skin damage on forehead and scalp
actinic keratosis Abbreviation: AK
Synonym: solar keratosis See: sunscreen
A rough, sandpaper-textured, premalignant macule or papule caused by excess exposure to ultraviolet light. AKs often appear on facial skin (such as near the eyes, on the nose, on the ears, or the lips) and the parts of the body that receive the most sunlight exposure. Prevention of AKs depends on limiting one's exposure to sunlight, beginning in childhood and continuing throughout life. See: illustration
Liquid nitrogen destroys these lesions and prevents them from progressing to other cancers of the skin.
keratosis follicularisDarier's disease.
keratosis nigricansAcanthosis nigricans.
Keratinization of the mucosa of the mouth to an unusual extent, or in locations normally not keratinized, as a result of an inherited autosomal dominant gene or the more common effect of tobacco and other carcinogens.
keratosis palmaris et plantaris
A congenital abnormality of the palms and soles, characterized by a dense thickening of the keratin layer in these regions.
Horny projections from the pharyngeal tonsils and adjacent lymphoid tissue.
Chronic inflammatory disorder of area surrounding the hair follicles. It is often found in patients with atopic dermatitis. Synonym: lichen pilaris
; lichen spinulosus
The disorder is characterized by an accumulation of horny material at follicular orifices of persons with rough, dry skin. It is most pronounced in winter on lateral aspects of thighs and upper arms with possible extension to legs, forearms, and scalp.
There is no specific therapy, but keratolytic lotions may be of some value.
Discrete horny projections from the sweat pores of the palms and soles.
SEBORRHEIC KERATOSES ON BACK
Synonym: wart, seborrheic See: illustration
A benign skin tumor that may be pigmented. It is composed of immature epithelial cells and is quite common in older adults. Its etiology is unknown.
Keratoid, nevoid, acanthoid, or verrucose types occur in older adults and in those with long-standing dry seborrhea, on the face, scalp, interscapular or sternal regions, and backs of the hands. The yellow, gray, or brown sharply circumscribed lesions are covered with a firmly adherent scale, greasy or velvety on the trunk or scalp but harsh, rough, and dry on the face or hands.
Thorough curettage is effective. This leaves a flat surface that becomes covered with normal skin within about 1 week. Pedunculated lesions can be removed surgically. Cautery may produce scarring and should not be used.
An inaccurate synonym for actinic keratosis, which is caused by accumulated ultraviolet light exposure, not by aging.
smokeless tobacco keratosisTobacco pouch keratosis.
snuff keratosisTobacco pouch keratosis.
solar keratosisActinic keratosis.
STUCCO KERATOSIS: White warty lesions of the dorsum of the fist
Benign papules, typically found on the lower extremities, histologically related to seborrheic keratoses. See: illustration
tobacco pouch keratosis
A white, corrugated lesion found on the oral mucosa usually in the muccobuccal fold where chewing tobacco has been habitually placed. Synonym: smokeless tobacco keratosis; snuff keratosis
any horny growth on the skin, such as a wart or callosity; a firm, elevated, circumscribed area of excessive keratin production. Common in humans but uncommon in animals.
varies from a sharply outlined verrucous or keratotic growth to poorly defined areas of erythema, which are premalignant lesions. Due to excessive exposure to the sun. Called also solar keratosis.
hyperkeratosis limited to the hair follicles.
seborrheic keratosis, keratosis seborrheica
single or multiple elevated plaques and nodules often hyperpigmented with a hyperkeratotic greasy surface. They are benign, of unknown etiology, but have no connection with seborrhea. Occur in dogs and humans.
see actinic keratosis (above).
emanating from or pertaining to the sun's rays.
degenerative changes in the dermis caused by excessive solar radiation.