Photoallergy is a form of allergic contact dermatitis in which the allergen must be activated by light to sensitize the allergic response, and to cause a rash on subsequent exposure. The second and subsequent exposures produce photoallergic skin conditions which are often eczematous. This article needs cleanup. ... Dermatitis is a term literally meaning inflammation of the skin. It is usually used to refer to eczema, which is also known as Dermatitis eczema. ... An allergen is any substance (antigen), most often eaten or inhaled, that is recognized by the immune system and causes an allergic reaction. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. ... A typical rash A rash is a change in the skin which affects its appearance or texture. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

See also: Photodermatitis Photodermatitis is a reaction of the skin to UV rays of the sun. ...