Irritant Contact Dermatitis

What Is It?

Irritant contact dermatitis (ICD) is the most common type of contact dermatitis — accounting for approximately 80% of all cases. Unlike allergic contact dermatitis, ICD is not an immune reaction. It results from direct physical or chemical damage to the skin barrier, and can occur in anyone exposed to a sufficient concentration of an irritant.

How Is It Different from ACD?

• ICD can happen on first exposure; ACD requires prior sensitization
• ICD tends to have sharper, better-defined borders
• ICD often presents with burning or stinging more than itch
• ICD is dose-dependent — the stronger the irritant, the faster the reaction
• Both can coexist in the same patient

Common Causes

• Wet work: Frequent handwashing, dishwashing, healthcare work
• Soaps & detergents: Disrupt the skin's natural lipid barrier
• Solvents & cleaning agents: Common in industrial and healthcare settings
• Acids & alkalis: Chemical burns from prolonged contact
• Low humidity environments: Can exacerbate skin dryness and cracking
• Friction: Repeated mechanical rubbing can cause chronic ICD
• Diapers: A classic cause in infants (diaper rash)

Treatment & Prevention

• Minimize contact with the irritant (gloves, protective barriers)
• Frequent moisturizing to repair the skin barrier
• Use fragrance-free, gentle cleansers
• Topical corticosteroids for active flares
• Emollient-based barrier creams before irritant exposure
• Time away from offending exposures often leads to resolution