A reaction that may be immediate

Contact urticaria is a skin reaction appearing after contact with certain substances. It may include wheals, redness and itching through immunological or non-immunological mechanisms. It is not synonymous with contact dermatitis, although both can relate to work and coexist in one person.

Reconstruct exposure

Investigation considers products, foods, proteins, gloves and handled materials according to the job. Onset timing, affected area and preceding tasks matter. Trade names alone may be insufficient: components and recent changes need identification. A photograph supplied to the professional may help if the lesion disappears before consultation.

Do not confirm the cause through re-exposure

Deliberately repeating contact outside an appropriate clinical setting can provoke a significant reaction. The person must not be asked to use a product again to prove the problem. Testing and interpretation belong to professionals. Timing provides guidance but cannot distinguish every possible mechanism and cause.

Reduce contact

Measures depend on agent and task: substitution, closed systems, utensils and organisation can avoid exposure. Gloves require specific selection because some materials or components can also cause problems. A cream does not replace elimination of triggering contact or make every product suitable for a sensitised person.

Investigation example

In a hypothetical situation, a food handler develops wheals soon after a particular task. The healthcare team reviews history and decides the investigation, while prevention staff document ingredients, gloves and cleaning products. Everything is not attributed to food without examining other contacts. Interim measures avoid repeating suspect exposure while the case is clarified.

Follow-up and warning signs

A reaction accompanied by breathing difficulty, severe dizziness or swelling of the mouth or throat requires urgent attention. Routine follow-up must check that measures work and protect clinical confidentiality. Collective prevention may require material or process changes without disclosing individual diagnosis or merely passing the problem to another person.