Background:
Protein contact dermatitis is better known in food-service and health-care workers than in industrial workers. Cornstarch has seldom been a problem, although it can cause contact urticaria to glove powder.
Objective:
To present the case of a paper-bag maker who developed severe occupational (protein) contact dermatitis within two-three hours after returning to work. She lacked any evidence of urticaria and demonstrated largely negative patch-test results.
Methods:
Following a history of occupational exposure to a cornstarch-based adhesive, the patient was patch-tested to materials with which she had worked, which she contacted, and with which she had attempted treatment. Following patch testing, she was prick-tested to cornstarch, the principal ingredient in the adhesive.
Results:
Patch testing was negative except for a very mild reaction to the adhesive. Prick testing to cornstarch was more severe than the histamine control. The test site became eczematous and remained so for more than ten weeks. Avoidance of cornstarch and the adhesive was followed by clearing.
Conclusion:
Workup for prominent occupational contact dermatitis without urticaria may some- times require testing for type 1 allergy.
