Occupational dermatitis with simultaneous immediate and delayed allergy to chrysanthemum.

A 42-year-old woman had recurrent dermatitis on the hands, arms, face and trunk for 5 years. She was allergic to chrysanthemum, with positive patch tests. She also had contact urticaria to chrysanthemum, with a wheal-and-flare reaction 15 min after application of chrysanthemum juice to a scratch test site. This was not seen in control subjects. The co-existence of allergic contact dermatitis and contact urticaria from chrysanthemum might play a rôle in the development of dermatitis, especially severe chronic dermatitis of her hands.