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Actinic keratosis (AK), sometimes called solar keratosis or senile keratosis, [1] [2] is a pre-cancerous [3] area of thick, scaly, or crusty skin. [ 4 ] [ 5 ] Actinic keratosis is a disorder ( -osis ) of epidermal keratinocytes that is induced by ultraviolet (UV) light exposure ( actin- ).
Cutaneous squamous-cell carcinoma tends to arise from actinic keratoses (premalignant lesions); surface is usually scaly and often ulcerates (as shown here). Specialty: Dermatology, plastic surgery, otorhinolaryngology: Symptoms: Hard lump with a scaly top or ulceration. [1] Risk factors
Similarly, sun or especially UV exposure is an important risk factor for both actinic keratosis which can progress into melanomas [10] as well as skin cancer. Smoking is a risk factor for premalignant (as well as malignant) lung lesions. Hereditary conditions that are risk factors to cancer can also be risk factors to premalignant lesions.
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
Actinic cheilitis is cheilitis (lip inflammation) caused by long term sunlight exposure. Essentially it is a burn , [ 2 ] and a variant of actinic keratosis which occurs on the lip. [ 5 ] It is a premalignant condition , [ 6 ] as it can develop into squamous cell carcinoma (a type of mouth cancer ).
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.
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.
Skin cancer; A basal-cell skin cancer.Note the pearly appearance and telangiectasia.: Specialty: Oncology and dermatology: Symptoms: Basal-cell: painless raised area of skin that may be shiny with small blood vessel running over it or ulceration [1]
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