But a number of chemicals corrode or burn the skin, others dissolve the outer layer. Once chemicals enter through the skin, they may be carried away in the blood stream, causing harm to the organs or to bodily functions related to breathing, the nervous system, and so on. 1.2 A cross-sectional view of the skin showing different protective layers Heavy exposure to potentially harmful chemicals may occur during such activities as wood polishing if no protective measures are adopted Most alkaline and acids have corrosive action on the skin and can cause burns and boils. Most organic solvents can penetrate through the protective layer of the skin. If the skin is damaged by cuts, burns or other injuries, it is more likely to be penetrated by chemicals.
Many pesticides also cause skin and other health problems.
Contact dermatitis is caused when the skin becomes tender, reddens and cracks through acids, alkalis, solvents, detergents and cutting liquids. Once the source of exposure is removed, the skin heals itself. The healing process may take several months. Allergic contact dermatitis is similar to contact dermatitis except that the skin becomes sensitized to certain chemicals and the allergy usually persists throughout the life of the affected person. Once someone comes in contact with the substance again, the symptoms return.