Allergic contact dermatitis is a reaction that starts with exposure to an allergen followed by an allergic reaction after exposure. The most prominent symptom of allergic contact dermatitis is itchiness. The rash is often red and raised but can also be scaly or swell up. Where the rash appears and its pattern depends on the allergen and the exposure. Contact dermatitis often spreads with scratching and can develop as long as two or three days after exposure to the irritant.

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