LYCOS RETRIEVER 
Dermatitis: Substances
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Allergic contact dermatitis can develop quickly after only a few contacts with a substance like shampoos or colours. Sometimes it can take months or even years for the allergy to develop. Once you are allergic, you are allergic for life and this could happen at any time, even if you have had no problems previously in your career.
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Since perioral dermatitis makes the skin very dry, any treatment of perioral dermatitis needs to help the skin regain its moisture retention capacity. Just moisturizing your skin isn't enough. When a moisturizer is applied, it hydrates the cells, but the cells quickly lose the moisture. If substances that work synergistically together to restore the skin cells' elasticity are applied to the skin, then as the healing progresses, the cells continue to admit moisture as before, but after the healing are better able to keep it from escaping.
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Contact dermatitis is characterized by itchiness, swelling, redness of the skin and blisters. These blisters may open and ooze, then crust and have scale. The skin inflammation occurs where the irritating or allergy producing substance has touched the skin.
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Contact dermatitis is an inflammation of the skin at the area of contact. There are two types of contact dermatitis – irritant and allergic. Your physician may diagnose irritant or allergic contact dermatitis from your medical history, occupation, symptoms, and patch testing. Treatment of both irritant and allergic contact dermatitis is based on avoiding contact with the substance(s) that caused the reaction.
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Sometimes contact dermatitis results only after a person touches certain substances and then exposes the skin to sunlight (photoallergic or phototoxic contact dermatitis). Such substances include sunscreens, aftershave lotions, certain perfumes, antibiotics,
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Irritant contact dermatitis occurs in response to irritating substances such as household cleaners, harsh soaps and industrial solvents. Your skin can react to these substances within minutes or hours, and stops reacting soon after they are gone.
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