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Dermatology
FrostbiteExposure to dry cold well below freezing causes frostbite, with resultant structural and functional disturbances of the small blood vessels, cells, nerves, and skin |
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ImpetigoImpetigo is a primary superficial bacterial skin infection, initially vesicular or bullous, later crusted. Impetigo may only involve the openings of hair follicles |
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Malignant MelanomaMalignant melanoma usually arises either from prevously normal-looking skin, or a benign melanocytic naevus. It may also arise from a naevus in a nail bed, in a mucous membrane or from the choroid or the iris |
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MelanomaMelanoma (also called malignant melanoma or cutaneous melanoma) accounts for only about 4% of all cases of skin cancer, but causes 79% of deaths from skin cancer. The American Cancer Society predicts 47,700 new cases of melanoma will occur in the United S |
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Molluscum ContagiosumA poxvirus infection characterised by skin-coloured, smooth, waxy, umbilicated papules 2 to 10mm in diameter. A giant single molluscum may grow 2 or 3 times as large |
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Other mite infestations of the skinDogs, cats, birds, grain and stored foodstuffs are sometimes sources of mites that can attack man, producing itchy papules, often topped by tiny vesicles, and weals. Diagnosis involves finding the offending mite, eg. from brushings of pets |
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Pityriasis VersicolorPityriasis (tinea) versicolor is a superficial infection caused by the mycelial form of the commensal yeast Pityrosporum orbiculare (also known as Malassezia furfur |
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Pruritus AniThe perianal skin has a maximum "readiness to itch". Pruritus ani has many causes: |
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