Dermatitis Dermatitis is an inflammation of the skin from exposure to an irritant. The degree of inflammation is affected by the type of skin (pigmentation, dryness, hairiness), age, sex, season of the year, history of previous skin disease or allergies, and personal hygiene. Although one exposure to a substance may be enough to cause a skin reaction, workers can become sensitized through prolonged and repeated exposures to a substance. The delay can be as short as a day, but can be as long as several months. Generally, causes of dermatitis are chemical, mechanical, physical, or biological. Chemicals can produce reactions ranging from chemical...