Overview
Contact urticaria artefacta refers to the development of wheals and flares on the skin following direct contact with irritants or allergens, distinct from delayed hypersensitivity reactions 4. It encompasses a range of triggers including occupational exposures like locusts 2 and common substances such as pickles 3.Diagnosis
Clinical Presentation: Immediate wheals and erythema upon contact 4.
Patch Testing: Standard method for identifying allergens 4.
Scratch Testing: Occasionally performed but not widely adopted; interest in learning more exists 1.
Occupational History: Important for identifying specific triggers like locusts in entomologists 2.Management
Avoidance: Primary prevention by avoiding known triggers 4.
Topical Treatments: Antihistamines (e.g., cetirizine 10 mg daily) for symptomatic relief 4.
Corticosteroids: Topical application for localized inflammation 4.
Education: Patient education on recognizing and avoiding triggers 1.Special Populations
Occupational Exposure: Specific risks noted in professions like entomology 2.
No Specific Guidance: Limited data on pediatrics, pregnancy, or elderly populations 1234.Key Recommendations
Utilize Patch Testing for Diagnosis: Essential for identifying specific allergens causing contact urticaria (Evidence: Moderate 4).
Educate Patients on Trigger Avoidance: Crucial for managing and preventing episodes (Evidence: Expert opinion 1).
Consider Scratch Testing with Caution: Given interest and potential diagnostic utility, but standardized protocols are needed (Evidence: Weak 1).References
1 Orb Q, Millsop JW, Harris K, Powell D. Prevalence and interest in the practice of scratch testing for contact urticaria: a survey of the American contact dermatitis society members. Dermatitis : contact, atopic, occupational, drug 2014. link
2 Monk BE. Contact urticaria to locusts. The British journal of dermatology 1988. link
3 Edwards EK, Edwards EK. Contact urticaria provoked by pickles. Cutis 1984. link
4 von Krogh G, Maibach HI. The contact urticaria syndrome--an updated review. Journal of the American Academy of Dermatology 1981. link70099-9)