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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.
Stucco keratosis (digitate seborrheic keratosis, hyperkeratotic seborrheic keratosis, keratosis alba, serrated seborrheic keratosis, verrucous seborrheic keratosis) Superficial basal cell carcinoma (superficial multicentric basal cell carcinoma) Syringadenoma papilliferum (syringocystadenoma papilliferum)
Seborrhoeic dermatitis (also spelt seborrheic dermatitis in American English) is a long-term skin disorder. [4] Symptoms include flaky, scaly, greasy, and occasionally itchy and inflamed skin. [ 2 ] [ 3 ] Areas of the skin rich in oil -producing glands are often affected including the scalp , face, and chest. [ 4 ]
Seborrheic-like psoriasis (also known as "Sebopsoriasis", [36] and "Seborrhiasis") is a skin condition characterized by psoriasis with an overlapping seborrheic dermatitis. [3]: 193 Sebaceous adenoma, a benign slow-growing tumour—which may, however, in rare cases be a precursor to a cancer syndrome known as Muir–Torre syndrome. [5]
More severe cases are characterized by dark crusty patches on the skin that are mildly greasy and that can emit a strong odor. These patches, also known as keratotic papules, keratosis follicularis, or dyskeratosis follicularis, most often appear on the arms, chest, back and legs. [4] DD was initially studied by dermatologists.
Such cells might then aggregate into a spot with an irregular shape. [13] They propose that the protrusion of a flat spot is a result of the death of aged cells in the spot and release of lipofuscin bodies. [13] The aggregating cells would form a capsule, and the dense lipofuscin bodies make the protruding spot soft and dark in color. [13]
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Keratosis (from kerat-+ -osis) [1] is a growth of keratin on the skin or on mucous membranes stemming from keratinocytes, the prominent cell type in the epidermis. More specifically, it can refer to: actinic keratosis (also known as solar keratosis), a premalignant condition; chronic scar keratosis; hydrocarbon keratosis
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