To the Editor: A 55-year-old woman presented with
recurrent idiopathic urticaria and cheilitis. Her symptoms
began 2 years ago following dental work, with
intermittent lip swelling and daily hives occurring
over 10 months. She received 5- to 7-day tapered
courses of 40 mg prednisone on 8 occasions during
this time, and her symptoms ultimately remitted
spontaneously. Prior allergy workup for urticaria,
including patch testing (via TRUE test) was mildly
positive only for thimerosal and fragrance. Prick
testing for environmental allergens was negative