Urticaria (hives)

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Urticaria (hives)

What is urticaria?

The triple response:
1) Vasodilation  erythema
2) Increased vascular permeability  wheal
3) Axon reflex  flare

Dermatographism:
Patients develop linear wheals at the site of stroking the skin – may have intense itching.
Linear raised red lines after scratching

More common in third trimester of pregnancy

Treatment:
Identify allergen
Antihistamines

Acute urticaria

Aetiology – foods, drugs, viral infections, bites, stings

Clinical features:
Characteristically have itchy red raised pink plaques with no scales that are in a different place each day

Treatment:
Antihistamines
ACE inhibitors, NSAID’s, aspirin should be avoided as can exacerbated

Cold Urticaria:
Urticaria develops after exposure to cold

Clinical features:
Lesions develops on fingers after cold exposure
Also can get swelling of head, face and ears – get a feeling of “fullness” of the throat

Treatment:
Antihistamines

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