Ultraviolet radiation

There are three types of ultraviolet radiation—the short wavelength ultraviolet C (100-280nm), ultraviolet B (290320 nm), and long wavelength ultraviolet A (320-400 nm). Beyond this is visible light then infrared, and radiowaves. ultraviolet C does not penetrate beyond the stratosphere as it is absorbed by the ozone layer. Ultraviolet B is very important in both sunburn and the development of skin cancer. Ultraviolet A is thought to be of increasing importance in the development of skin cancer, and causes tanning but not sunburn. It is also important in people with photosensitivity. The effects of ultraviolet radiation may be classified as short term (sunburn, photosensitivity) or long term (skin cancer, wrinkling, solar elastosis, solar keratoses, seborrhoeic warts).

There is general awareness that the sun causes cancer in the skin, with some people becoming obsessively fearful of any exposure to sun. A sensible approach with emphasis on reasonable precautions is called for. Useful points are:

• Most moles are entirely harmless.

• Detecting the changes in moles or early melanoma enables the diagnosis to be made at an early stage with a good chance of curative treatment.

• The non-melanotic, epidermal cancers—basal cell and squamous cell carcinomas—grow slowly and are generally not life threatening. But squamous cell carinoma arising at sites of trauma, on the extremities, or in ulcers may metastasise. Exposure to sun has usually occurred many years previously.

How To Reduce Acne Scarring

How To Reduce Acne Scarring

Acne is a name that is famous in its own right, but for all of the wrong reasons. Most teenagers know, and dread, the very word, as it so prevalently wrecks havoc on their faces throughout their adolescent years.

Get My Free Ebook


Post a comment