Urticaria

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    Papules: transient, erythematous, oedematous, pruritic, resembling nettle stings.

    Look for a cause: food or drug (particularly antibiotic) allergy, insect bites; the invasive stage of a bacterial or parasitic infection (ascariasis, strongylodiasis, ancylostomiasis, schistosomiasis, loiasis), viral infection (hepatitis B or C); generalised disease (cancer, lupus, dysthyroidism, vasculitis).

    Treatment

    • If the pruritus is intense, antihistamines for a few days:
      loratadine PO
      Children over 2 years and under 30 kg: 5 mg (5 ml) once daily
      Children over 30 kg and adults: 10 mg (1 tab) once daily
      or
      chlorphenamine PO 
      Children 1 to < 2 years: 1 mg 2 times daily
      Children 2 to < 6 years: 1 mg 4 to 6 times daily (max. 6 mg daily)
      Children 6 to < 12 years: 2 mg 4 to 6 times daily (max. 12 mg daily)
      Children ≥ 12 years and adults: 4 mg 4 to 6 times daily (max. 24 mg daily; 12 mg daily in elderly patients)
    • In the event of anaphylactic reaction, see Shock (Chapter 1).