Contact dermatitis: Signs and symptoms

Allergic contact dermatitis: Testing revealed that this woman is allergic to an ingredient in her shampoo. Rinsing off the shampoo caused this rash.

Irritant contact dermatitis: Handling fish irritated this patient’s skin, causing a painful rash.

Allergic contact dermatitis: Some people have an allergic reaction only when they sweat or UV light hits their skin. Sunlight triggered this bartender’s severe reaction to lime juice.