What is Contact Dermatitis and Its Treatment
What is Contact Dermatitis and Its Treatment
Contactdermatitis is an inflammation of the skin caused by direct contact with an irritating or allergy-causing substance (irritant or allergen). Reactions may vary in the same person over time. A history of any type ofallergies increases the risk for this condition. Initialcontact dermatitis treatment includes thorough washing with lots of water to remove any trace of the irritant that may remain on the skin.
You should avoid further exposure to known irritants or allergens. Contact dermatitis may involve a reaction to a substance that you are exposed to, or use repeatedly. Although there may be no initial reaction, regular use (for example, nail polish remover, preservatives in contact lens solutions, or repeated contact with metals in earring posts and the metal backs of watches) can eventually cause sensitivity and reaction to the product.
Some products cause a reaction only when they contact the skin and are exposed to sunlight (photosensitivity). These include shaving lotions, sunscreens, sulfa ointments, some perfumes, coal tar products, and oil from the skin of a lime. A few airborne allergens, such as ragweed or insecticide spray, can cause contact dermatitis.
Contact dermatitis is a common condition that can be categorized as irritant dermatitis and allergic contact dermatitis. Although each of these conditions may have a similar presentation, allergic contact dermatitis is immunologically mediated, whereas irritant contact dermatitis is not. Contact dermatitis can be acute, subacute, or chronic, and each of these phases may progress into the next. Almost any substance may induce a cutaneous reaction, depending on its concentration, the duration of contact, and the condition of the contacted skin.
It is estimated that there are more than 6 million chemicals in the environment; approximately 3000 are potential sensitizers. A careful history may identify the responsible agent. If the contactant is identified and eliminated, the contact dermatitis can be a self-limited, mild condition. If the exposure is not discontinued, a cycle of itching, scratching, and skin disruption occurs, which leads to chronic changes in the skin.
The history of presentation, including occupational exposures, and distribution of the rash are important in identifying the offending agent. More severe cases may require more extensive evaluation, possibly including patch testing, to determine the offending agent. This article reviews treatment, including antihistamines, topical and oral steroids, physical measures such as cold water compresses, and the treatment of secondary infection.
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