Keratosis, actinic
A small rough spot on skin chronically exposed to the sun, precancerous, can develop into a skin cancer called squamous cell carcinoma, a process that typically takes years. Occurs most frequently in fair-skinned people, common locations being the face, scalp, nape of neck, upper chest, forearms and backs of hands. Prevention is by minimizing sun exposure. Treatments include cryosurgery (freezing them with liquid nitrogen), cutting them away, burning them, putting 5-fluorouracil (5-FU) on them, and photodynamic therapy (which involves injecting into the bloodstream a chemical that collects in actinic keratoses and makes them more sensitive to exposure to a specialized form of light).

Medical dictionary. 2011.

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  • keratosis — noun /ˌkɛrəˈtəʊsɪs,ˌkɛrəˈtoʊsɪs/ The condition of keratin growing on the skin. See Also: actinic keratosis, seborrheic keratosis, keratosis pilaris …   Wiktionary

  • actinic — adjective Date: 1844 of, relating to, resulting from, or exhibiting chemical charges produced by radiant energy especially in the visible and ultraviolet parts of the spectrum < actinic light > < actinic keratosis > • actinically adverb …   New Collegiate Dictionary

  • actinic — Relating to the chemically active rays of the electromagnetic spectrum. [G. aktis (aktin ), a ray] * * * ac·tin·ic ak tin ik adj of, relating to, resulting from, or exhibiting chemical changes produced by radiant energy esp. in the visible and… …   Medical dictionary

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