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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.
Many seborrheic keratoses on the back of a person with Leser–Trélat sign due to colon cancer. The Leser–Trélat sign is the explosive onset of multiple seborrheic keratoses [1] (many pigmented skin lesions), [2] [3] often with an inflammatory base. This can be a sign of internal malignancy as part of a paraneoplastic syndrome. In addition ...
Chronic scar keratosis (chronic cicatrix keratosis) Clonal seborrheic keratosis; Common seborrheic keratosis (basal cell papilloma, solid seborrheic keratosis) Cowden syndrome (Cowden's disease, multiple hamartoma syndrome) Cutaneous ciliated cyst; Cutaneous columnar cyst; Cutaneous horn (Cornu cutaneum) Cystic basal cell carcinoma
Keratoacanthoma (KA) is a common low-grade (unlikely to metastasize or invade) rapidly-growing skin tumour that is believed to originate from the hair follicle (pilosebaceous unit) and can resemble squamous cell carcinoma.
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
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 ]
Pseudohyphae and spores in 90% of patients with candida folliculitis Aspergillosis: Septate hyphae with 45-degree angle branching and/or aspergillus heads Blastomycosis: Broad-based budding spores 57.7 - 93% sensitive Sporotrichosis: Spherical, oval or cigar-shaped yeasts and asteroid bodies 84.9% sensitive and 57.9% specific Viral infections
Actinic keratosis, pre-cancerous area of thick, scaly, or crusty skin (Below) with cutaneous horn tissue (above) Cutaneous horns , also known by the Latin name cornu cutaneum , are unusual keratinous skin tumors with the appearance of horns, or sometimes of wood or coral.