anaphylaxis

Cutaneous allergy encompasses a broad spectrum of clinical presentations with complex underlying immunological mechanisms. Allergy may be  considered to play a role in disorders that include atopic dermatitis, contact dermatitis, urticaria, angioedema, anaphylaxis and adverse drug reactions. The skin phenotypes associated with allergy are more commonly exhibited in non-allergic disease and so a high proportion of patients who consider themselves allergic in truth have other, nonallergic explanations for their presentation.

Anaphylaxis is the quintessential medical emergency where prompt recognition and treatment is life-saving. In the UK the incidence is increasing year on year, and is most common in the sixth and seventh decades of life. More than half of cases are iatrogenic in nature, most of the rest are caused by venom (stings) and food substances. The clinical signs can be subtle, but an acute onset of skin or mucosal oedema with respiratory compromise or reduced blood pressure should alert the physician to the diagnosis.