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Dermatosis (plural: dermatoses) is a broad term that refers to any disease of the skin, especially one that is not accompanied by inflammation.
Do not confuse this term with dermatitis, which is limited to inflammation of the skin.
There are over two dozen specific types of reactive and inflammatory dermatoses; see this list at healthline.com for more information about specific types.
Dermatosis can have many causes, including allergic reactions to common metals such as nickel (found in jewelry) or cobalt, fragrances, and topical antibiotics. Formaldehyde can also cause dermatitis/dermatosis, and it is a sensitizer as well, meaning that it can make your body or skin sensitive or allergic to substances that previously presented no problems.
The mechanism by which a particular chemical causes dermatosis/dermatitis can vary. For example, some substances cause a "simple" allergic reaction, whereas prolonged exposure to hydrocarbon solvents can leach the natural oils from your skin and lead to irritation, dryness, cracking and/or redness.
Failure to use proper skin protection (gloves, aprons etc.) can result in irritation or even poisoning by absorption of the material through the skin. Always use properly selected gloves and appropriate protective clothing when working with hazardous materials.
See also: dermal, dermal toxicity, dermatitis, erythema, urticaria.
Additional definitions from Google and OneLook.
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