Poikiloderma
Mae Poikiloderma yn gyflwr croen sy'n cynnwys ardaloedd o hypopigmentation, hyperbigmentation, telangiectasias ac atroffi. Mae poikiloderma i'w weld amlaf ar y frest neu'r gwddf, a nodweddir gan bigment lliw coch ar y croen sy'n cael ei gysylltu'n gyffredin â niwed i'r haul.
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References
Mae Poikiloderma of Civatte yn gyflwr croen cyffredin sy'n ymddangos yn bennaf ar y gwddf a'r wyneb, yn enwedig mewn merched â chroen gweddol ar ôl y menopos. Mae'n ymddangos fel cymysgedd o linellau coch, smotiau tywyll, a chroen tenau. Yn nodweddiadol, mae'n effeithio ar ardaloedd sy'n agored i'r haul, fel yr wyneb, y gwddf a'r frest, ond nid ardaloedd cysgodol. Gellir categoreiddio Poikiloderma of Civatte yn seiliedig ar ei brif nodweddion: cochni, smotiau tywyll, neu gymysgedd o'r ddau. Nid yw'r union achos yn cael ei ddeall yn llawn, ond credir bod ffactorau fel amlygiad i'r haul, newidiadau hormonaidd, adweithiau i bersawr neu gosmetig, a heneiddio yn chwarae rhan. Poikiloderma of Civatte yn tueddu i waethygu'n araf dros amser.
Poikiloderma of Civatte (PC) is a rather common benign dermatosis of the neck and face, mainly affecting fair-skinned individuals, especially postmenopausal females. It is characterized by a combination of a reticular pattern of linear telangiectasia, mottled hyperpigmentation and superficial atrophy. Clinically, it involves symmetrically sun-exposed areas of the face, the neck, and the V-shaped area of the chest, invariably sparing the anatomically shaded areas. Depending on the prevalent clinical feature, PC can be classified into erythemato-telangiectatic, pigmented, and mixed clinical types. The etiopathogenesis of PC is incompletely understood. Exposure to ultraviolet radiation, hormonal changes of menopause, contact sensitization to perfumes and cosmetics, and normal ageing have been incriminated. The diagnosis is usually clinical and can be confirmed by histology, which is characteristic, but not pathognomonic. The course is slowly progressive and irreversible, often causing significant cosmetic disfigurement.
Poikiloderma of Civatte (PC) is a rather common benign dermatosis of the neck and face, mainly affecting fair-skinned individuals, especially postmenopausal females. It is characterized by a combination of a reticular pattern of linear telangiectasia, mottled hyperpigmentation and superficial atrophy. Clinically, it involves symmetrically sun-exposed areas of the face, the neck, and the V-shaped area of the chest, invariably sparing the anatomically shaded areas. Depending on the prevalent clinical feature, PC can be classified into erythemato-telangiectatic, pigmented, and mixed clinical types. The etiopathogenesis of PC is incompletely understood. Exposure to ultraviolet radiation, hormonal changes of menopause, contact sensitization to perfumes and cosmetics, and normal ageing have been incriminated. The diagnosis is usually clinical and can be confirmed by histology, which is characteristic, but not pathognomonic. The course is slowly progressive and irreversible, often causing significant cosmetic disfigurement.
