Ebook ABC of dermatology (4/E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook ABC of dermatology (4/E): Part 2
Ebook ABC of dermatology (4/E): Part 2
14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2to strong sunlight ill countries such as Australia. gel skill cancer very readily. Australia has the highest incidence of skin cancer in the world, with 140000 new cases pel year, and 1200 deaths per year, mainly from melanoma.Il is theielbie important Io understand that there is a variation in skin Ebook ABC of dermatology (4/E): Part 2 sensitivity to sunlight. I llis is rated from one to six (Fitzpatrick classific ation). Skill type one subjects have led hair and do not tan. burn veEbook ABC of dermatology (4/E): Part 2
ry easily in the sun and develop skin cancer readily, whereas skin type six subjects have lilac k skin (with an inbuilt sun protection factor of 10) a14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2tment.Ultraviolet radiationThere aie three ty pes of ultraviolet radiation—the short wavelength ultraviolet c (100-28Unm). ultraviolet B (290-320 mu), and long wavelength ultraviolet A (320-400Ilin). Beyond this is visible light then infrared, and radiowaves, ultraviolet c does not Jieiielrate heyon Ebook ABC of dermatology (4/E): Part 2d the stratosphere ax it is absorbed by the ozone layer. Ultraviolet B is very important in Ixilh sunburn and the development of skill earner. UltraviEbook ABC of dermatology (4/E): Part 2
olet A is thought to be of increasing importance in the development of skill lancer, and causes tanning but not sunburn, h is also important in people14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2 wrinkling, solar ekrslosis, solar keratoses, selxirrhoeic warts).There is general awareness that the sun causes cancer in the skill, with some people liecomitig olisessively fearful of any exposure to sun. A sensible approach with emphasis on ■rasonable precautions is railed for. Useful points are: Ebook ABC of dermatology (4/E): Part 2•Most moles air entirely harmless.•Detecting the changes in moles or early melanoma enables the diagnosis Io lie made al an early stage with a good chEbook ABC of dermatology (4/E): Part 2
ance of curative treatment.•The non melanotic, epidermal cancels basal cell and squamous cell carcinomas—grow slowly and arc generally not life threat14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2any years previously.Prevention of sun damage and skin cancerPrevention of sun damage and skin cancer will depend on reducing exposure IO ultraviolet radiation. This can hr achieved in a number of ways:•Covering the skin with clothes. It must be remembered however that light clothes such as shirts o Ebook ABC of dermatology (4/E): Part 2r blouses may only have a sun protection factor of four. A wide-brimmed hat is essential to protect the face and neck.•Sunscreens will greatly reduceEbook ABC of dermatology (4/E): Part 2
sun exposure for exposed parts such as the face and hands. Sunscreens are much moreSkin types and MUI•Type 1—Never tans, freckles, red hair, blue eyes14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2example. Indian)•Type 6—Black skin (for example, African)AboriginesEbook ABC of dermatology (4/E): Part 2
I v B uluuviulet tk IVA ultraviolet A)Diurnal variation in vv intensity <>r light from sun65ABC. of Dermatologyefficient than previously, particularly14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t Ebook ABC of dermatology (4/E): Part 2and ultraviolet A. This is important because there is now increasing evidence that ultraviolet A is important in the development of skin cancer.• Exposure to midday sun, particularly in tropical or subtropical latitudes, should be avoided. At this time of the day the sunlight passes vertically throu Ebook ABC of dermatology (4/E): Part 2gh the atmosphere anil there is less filtering of dangerous ultraviolet light. So remember the adage: “Between eleven anti three, stay under a tree" iEbook ABC of dermatology (4/E): Part 2
n the summer months.Effects of sunShort term•Sunburn14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed t14 The sun and the skinR St(: BarnctsonPeople with darkly pigmented skill very rarely gel skill cancel. Those of a Celtic constitution, when exposed tGọi ngay
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