Contact dermatitis HY

1. Contact dermatitis Allergic Irritant Pathophysiology Type IV hypersensitivity Physical or chemical irritation Triggers • Poison oak/ivy/sumac • Nickel • Rubber/latex • Leather dyes • Medications • Soaps/detergents • Chemicals • Acid/alkali Appearance • Primarily on exposed skin, well demarcated • Erythema • Papules/vesicles • Chronic lichenification • Commonly on hands • Erythema • Fissures