A 27-year-old male is referred to the allergy clinic for symptoms of hives for 2 months. Possible triggers have not been identified.

Figure 1. Urticaria appearing on right arm. Image source: Wikipedia, public domain.
What is the next step?

Figure 2. Mind map diagram of chronic urticaria.
Read more in Chronic Idiopathic Urticaria on AllergyCases.org.

Figure 1. Urticaria appearing on right arm. Image source: Wikipedia, public domain.
What is the next step?

Figure 2. Mind map diagram of chronic urticaria.
Read more in Chronic Idiopathic Urticaria on AllergyCases.org.