Poison Ivy Overview

Causes

Contact dermatitis 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 individual over time. A history of any type of allergies increases the risk for this condition.

Irritant dermatitis, the most common type of contact dermatitis, involves inflammation resulting from contact with acids, alkaline materials such as soaps and detergents , solvents, or other chemicals. The reaction usually resembles a burn .

The second most common type of contact dermatitis is caused by exposure to a material to which the person has become hypersensitive or allergic. The skin inflammation varies from mild irritation and redness to open sores, depending on the type of irritant, the body part affected, and the sensitivity of the individual.

Overtreatment dermatitis is a form of contact dermatitis that occurs when treatment for another skin disorder causes irritation.

Common allergens associated with contact dermatitis include: