seborrheic keratosis


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Related to seborrheic keratosis: actinic keratosis

keratosis

 [ker″ah-to´sis]
any horny growth, such as a wart or callosity.
actinic keratosis 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).
keratosis follicula´ris 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 palma´ris et planta´ris palmoplantar keratoderma.
keratosis pharyn´gea horny projections from the tonsils and pharyngeal walls. Called also pharyngokeratosis.
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, noninvasive tumor of epidermal origin, marked by numerous yellow or brown, sharply marginated, oval, raised lesions.
senile keratosis (solar keratosis) actinic keratosis.

seb·or·rhe·ic ker·a·to·sis

, keratosis seborrheica
superficial, benign, verrucous, often pigmented, greasy lesions consisting of proliferating epidermal cells, resembling basal cells, enclosing horn cysts; they usually occur after the third decade.

seborrheic keratosis

Senile keratosis Dermatology A benign, often numerous lesion of the face and upper trunk of older adults, which appear as wart-like growths in various colors; SKs may become irritated and itch because of friction from clothes. See Keratosis.

seb·or·rhe·ic ker·a·to·sis

, keratosis seborrheica (seb'ōr-ē'ik ker'ă-tō'sis, seb-ōr-ē'i-kă)
1. A superficial, benign, verrucous, often pigmented, greasy lesion consisting of proliferating epidermal cells, resembling basal cells, enclosing horn cysts; usually occur after the third decade.
2. Synonym(s): senile keratosis. Synonym(s): seborrhoeic keratosis.
Enlarge picture
SEBORRHEIC KERATOSES ON BACK

seborrheic keratosis

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.

Symptoms

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.

Treatment

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.

Synonym: wart, seborrheic See: illustration
See also: keratosis

seb·or·rhe·ic ker·a·to·sis

, keratosis seborrheica (seb'ōr-ē'ik ker'ă-tō'sis, seb-ōr-ē'i-kă)
Superficial, benign, verrucous, often pigmented, greasy lesions consisting of proliferating epidermal cells, resembling basal cells, enclosing horn cysts; usually occur after the third decade.
Synonym(s): basal cell papilloma.
References in periodicals archive ?
The role of immunosuppression in squamous cell carcinomas arising in seborrheic keratosis. J Am Acad Dermatol.
To the best of our knowledge, to date, no case of SNF accompanied by an eruptive seborrheic keratosis has been reported in the literature.
The benign lesions included dermal nevus, nevus sebaceous, Becker's nevus, seborrheic keratosis, compound nevus and verrucous epidermal nevus.
Seborrheic keratosis is considered to represent a clonal expansion, so the lesion qualifies as a neoplasm.
The important consideration in these cases is not the horn, but the underlying pathology which may be benign (Seborrheic keratosis, viral warts, histiocytoma, inverted follicular keratosis, verrucous epidermal nevus, molluscum contagiosum, etc.), premalignant (Solar keratosis, arsenical keratosis, Bowen's disease) or malignant (Squamous cell carcinoma, rarely basal cell carcinoma, metastatic renal carcinoma, granular cell tumour, sebaceous carcinoma or Kaposi's sarcoma.
These include common melanocytic nevi or moles, seborrheic keratosis, lentigines, pigmented actinic keratosis, pigmented BCC, dermatofibroma etc.
However, this fea-ture is not pathognomonic for porokeratosis and can be found in a number of other dermatological conditions, which include seborrheic keratosis, verruca vulgaris, actinic keratosis, squa-mous cell carcinoma in situ, basal-cell carcinoma, milia, and scars.
Some entities that can mimic melanoma include a halo nevus, solar lentigo, traumatized blue nevus, seborrheic keratosis, pigmented basal cell carcinoma, pigmented Bowen's disease, pigmented squamous cell carcinoma, and thrombosed angioma.
He reported that the mass had been biopsied 3 years earlier and was found to be a seborrheic keratosis. The patient complained of a new-onset bloody discharge from the lesion in addition to the development of a parotid mass.
The company said, ""The first quarter of 2018 was a busy one as we prepared for the launch of ESKATA(TM) (hydrogen peroxide) Topical Solution, 40% (w/w), the first and only FDA-approved topical treatment for raised seborrheic keratosis (SK).
The common skin disorders prevalent in elderly are xerosis, pruritus, dermatoheliosis (photoageing), benign tumours like acrochordons, seborrheic keratosis, cherry angioma, infections like herpes zoster, dermatophytosis, cellulitis, etc.