skin cancer Essay

Submitted By storan1011
Words: 381
Pages: 2

Sun exposure is the major known environmental factor associated with the development of skin cancer of all types. There are different patterns of sun exposure associated with each major type of skin cancer: basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma.
While there is no standard measure, sun exposure has generally been classified as intermittent or chronic, and its effects may be considered short-term or cumulative. Intermittent sun exposure is, by definition, sporadic, and is commonly associated with recreational activities, particularly among indoor workers who use weekend or vacation time to be outdoors and whose skin has not adapted to the sun. Chronic sun exposure is incurred by consistent, repetitive sun exposure, usually during outdoor work or more extensive recreational activities. Acute sun exposure is obtained over a short time on skin that has not adapted to the sun. Depending on the time of day and the skin type of the individual, acute sun exposure may result in sunburn. In epidemiology studies, sunburn is usually defined as an injury associated with pain and/or blistering that lasts for 2 or more days. Cumulative sun exposure is the additive amount of sun exposure that one receives over a lifetime. The impact of cumulative sun exposure likely reflects the additive effects of intermittent sun exposure or chronic sun exposure, or both.
Melanocytes make two forms of melanin, eumelanin and pheomelanin. The relative amounts of these two pigments help determine the…