Contact dermatitis is inflammation of the skin that follows direct contact with an irritating substance or an allergen. It can be irritant or allergic in origin. Below are common signs, typical triggers, practical prevention steps and guidance on when to see a healthcare professional.
Contact dermatitis covers two main mechanisms. Irritant contact dermatitis results from direct damage to the skin barrier by chemicals, repeated friction or prolonged wet work. Allergic contact dermatitis is a delayed immune response that develops after sensitisation to a specific substance. Both can look similar, so the exposure history helps to distinguish them.
Symptoms usually occur at the site of contact and include redness, itching, swelling, blistering or cracking. Acute reactions may show pronounced redness and fluid-filled blisters; repeated or chronic exposure often leads to dry, thickened and scaly skin. Scratching can cause secondary irritation or widen the affected area.
Common triggers include nickel in jewellery, fragrances and cosmetics, latex, hair dyes, some preservatives, epoxy resins and household cleaning agents. Occupational exposure raises the risk for healthcare workers, hairdressers, cleaners, construction workers and others who handle irritants or wet materials frequently.
Avoiding known triggers is the most effective measure: choose fragrance‑free products, limit direct skin contact with irritants and use protective gloves when appropriate. Support the skin barrier with gentle cleansers and regular, non‑perfumed moisturisers. Minimise prolonged wet work and dry the skin before applying emollients.
Mild, short-lived rashes often settle when exposure stops, but persistent, spreading or recurrent reactions merit a clinician review. Dermatologists or allergists may use clinical history and patch testing to identify specific allergens. If you experience sudden facial or throat swelling, breathing difficulties, widespread rash or fever, seek emergency medical care promptly.
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