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Scale: Dry or greasy laminated masses of keratin, [30] they represent thickened stratum corneum. [29] Crust: Dried sebum usually mixed with epithelial and sometimes bacterial debris [10] Lichenification: Epidermal thickening characterized by visible and palpable thickening of the skin with accentuated skin markings [1]
A seborrheic keratosis is a non-cancerous skin tumour that originates from cells, namely keratinocytes, in the outer layer of the skin called the epidermis.Like liver spots, seborrheic keratoses are seen more often as people age.
The scalp, ears, back, face, and upper arm, are common sites of sebaceous cysts, though they may occur anywhere on the body except the palms of the hands and soles of the feet. [4] They are more common in hairier areas, where in cases of long duration they could result in hair loss on the skin surface immediately above the cyst.
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Stratified-squamous epithelium with a granular layer that surrounding a cystic space filled with laminated keratin and a variable number of vellus hair cysts is seen to be present. [3] It can be difficult to distinguish from other skin conditions, including molluscum contagiosum and acne vulgaris but can be corroborated with histopathology.
Relative incidence of cutaneous cysts: Trichilemmal cyst is labeled near top. A trichilemmal cyst (or pilar cyst) is a common cyst that forms from a hair follicle, most often on the scalp, and is smooth, mobile, and filled with keratin, a protein component found in hair, nails, skin, and horns.
Pages in category "Epidermal nevi, neoplasms, and cysts" The following 200 pages are in this category, out of approximately 259 total. This list may not reflect recent changes .
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