| actinic prurigo | A form recurring each summer, becoming very severe as long as the hot weather continues. Synonym: actinic prurigo, summer prurigo. (05 Mar 2000) |
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| actinic | Relating to the chemically active rays of the electromagnetic spectrum. Origin: G. Aktis (aktin-), a ray (05 Mar 2000) |
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| actinic cheilitis | Mucosal atrophy with drying, crusting, and fissuring of the vermillion border of the lower lip in older individuals, resulting from chronic exposure to sunlight; dysplastic (premalignant) changes are noted microscopically, analogous to solar keratosis. Synonym: actinic cheilitis. (05 Mar 2000) |
| actinic conjunctivitis | Acute keratoconjunctivitis resulting from exposure to intense ultraviolet irradiation. Synonym: actinic conjunctivitis, arc-flash conjunctivitis, flash keratoconjunctivitis, ophthalmia nivalis, snow conjunctivitis, welder's conjunctivitis. (05 Mar 2000) |
| actinic dermatitis | Dermatitis caused or elicited by exposure to sunlight; may be phototoxic or photoallergic, and can result from topical application, ingestion, inhalation, or injection of mediating phototoxic or photoallergic material. See: photosensitization. Synonym: actinic dermatitis, actinodermatitis. Origin: photo-+ G. Derma, skin, + -itis, inflammation (05 Mar 2000) |
| actinic granuloma | An annular eruption on sun-exposed skin which microscopically shows phagocytosis of dermal elastic fibres by giant cells and histiocytes. Synonym: Miescher's granuloma. (05 Mar 2000) |
| actinic keratitis | A reaction of the cornea to ultraviolet light. (05 Mar 2000) |
| actinic keratosis | <dermatology> A skin lesion that is abnormally sensitive to the effects of ultraviolet light (sunlight). Thought to be a precancerous skin lesion that is more common in the fair-skinned or elderly individual. Approximately 20% of these skin lesions will develop into squamous cell carcinoma. Prevention includes the use of sun screen agents and the avoidance of drugs (for example tetracyclines) known to cause photosensitivity reactions. Usually a discreet slightly raised, red or pink lesion located on a sun exposed surface. Texture may appear as rough, gritty or scaly. Growths may be biopsied to look for cancer or removed via cryotherapy or electrical cautery. Some topical agents may be used to promote peeling. (27 Sep 1997) |
| actinic ray | A light ray toward and beyond the violet end of the spectrum that acts upon a photographic plate and produces other chemical effects. Synonym: chemical ray. (05 Mar 2000) |
| actinic reticuloid | Chronic pruritic erythema beginning on sun-exposed areas in elderly males, with marked thickening and ridging of exposed skin simulating lymphoma; there is infiltration by atypical CD8-positive T lymphocytes. Occurs after several years. (05 Mar 2000) |
| Besnier's prurigo | An atopic form which may be associated with asthma, hay fever, or other allergic conditions. (05 Mar 2000) |
| Hebra's prurigo | A severe form of chronic dermatitis with secondary infection in which there are constantly recurring, intensely itchy papules and nodules, often associated with atopy. Synonym: prurigo agria, prurigo ferox. (05 Mar 2000) |
| prurigo | <medicine> A papular disease of the skin, of which intense itching is the chief symptom, the eruption scarcely differing from the healthy cuticle in colour. Origin: L, an itching, the itch, fr. Prurire to itch. Source: Websters Dictionary (01 Mar 1998) |
| prurigo aestivalis | A form recurring each summer, becoming very severe as long as the hot weather continues. Synonym: actinic prurigo, summer prurigo. (05 Mar 2000) |
| prurigo agria | A severe form of chronic dermatitis with secondary infection in which there are constantly recurring, intensely itchy papules and nodules, often associated with atopy. Synonym: prurigo agria, prurigo ferox. (05 Mar 2000) |
| prurigo ferox | A severe form of chronic dermatitis with secondary infection in which there are constantly recurring, intensely itchy papules and nodules, often associated with atopy. Synonym: prurigo agria, prurigo ferox. (05 Mar 2000) |