DefinitionContact dermatitis is an inflammation of the skin caused by direct contact with an irritating substance.See also: Poison ivy - oak - sumacAlternative NamesDermatitis - contact; Allergic dermatitis; Dermatitis - allergicCauses, incidence, and risk factorsContact 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 person 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.Allergic contact dermatitis,