Varicella zoster virus
Poxvirus (Smallpox and Molluscum contagiosum)
Herpes simplex virus
Malassezia (Tinea versicolor and Seborrhoeic dermatitis)
Pediculus humanus and Phthirus pubis (Lice)
Sarcoptes scabiei (Scabies)
Human herpesvirus 6 (Roseola)
Varicella zoster virus
Human herpesvirus 8 (Kaposi sarcoma)
Pigmentation skin disorders: Pathology review
Acneiform skin disorders: Pathology review
Papulosquamous and inflammatory skin disorders: Pathology review
Vesiculobullous and desquamating skin disorders: Pathology review
Skin cancer: Pathology review
Bacterial and viral skin infections: Pathology review
Viral exanthems of childhood: Pathology review
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urticaria p. 489
ethosuxamide p. 565
scombroid poisoning p. 248
serum sickness p. 111
sulfa drug allergies p. 253
as type I hypersensitivity p. 111
urticaria p. 487
Urticaria, commonly referred to as hives, is a kind of skin rash notable for pale red, raised, itchy bumps, which can cause a burning or stinging sensation. Lesions are frequently caused by allergic reactions; however, there are many nonallergic causes, such as autoimmune disorders like thyroid disease.
Most cases of hives lasting less than six weeks (acute urticaria) are the result of an allergic trigger. Chronic urticaria (hives lasting longer than six weeks) is rarely due to an allergy. Treatment for urticaria typically involves identifying and avoiding triggers, as well as taking medication to relieve symptoms. Antihistamines are often prescribed to block the release of histamine and reduce itching and swelling. In severe cases, oral or injectable corticosteroids may be prescribed.
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