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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- ).
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.
Actinic_keratosis,_left_upper_paraspinal_back.jpg (244 × 226 pixels, file size: 19 KB, MIME type: image/jpeg) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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.
SCC of the skin begins as a small nodule and as it enlarges the center becomes necrotic and sloughs and the nodule turns into an ulcer, and generally are developed from an actinic keratosis. Once keratinocytes begin to grow uncontrollably, they have the potential to become cancerous and produce cutaneous squamous-cell carcinoma. [22]
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.
Lichenoid actinic keratosis; Lichenoid keratosis (benign lichenoid keratosis, lichen planus-like keratosis, solitary lichen planus, solitary lichenoid keratosis) Linear verrucous epidermal nevus (linear epidermal nevus, verrucous epidermal nevus) Malignant acrospiroma (spiradenocarcinoma) Malignant mixed tumor (malignant chondroid syringoma)
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