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Urticaria can be acute or chronic, spontaneous or inducible. A weal (or wheal) is a superficial skin-coloured or pale skin swelling, usually surrounded by erythema that lasts anything from a few minutes to 24 hours. Urticaria can co-exist with angioedema which is a deeper swelling within the skin or mucous membranes.
Acute urticaria can be induced by the following factors but the cause is not always identified. Acute viral infection — an upper respiratory infection, viral hepatitis, infectious mononucleosis. Acute bacterial infection — a dental abscess, sinusitis, mycoplasma. Food allergy (IgE mediated) — usually milk, egg, peanut, shellfish.
Chronic spontaneous urticaria is characterised by the presence of weals and angioedema. Weals can affect any site on the body and tend to be distributed widely. Weals can be a few millimetres or several centimetres in diameter. They can be coloured white or red, usually with a red flare.
Chronic urticaria describes transient weals coming and going for more than 6 weeks. Urticaria. Urticaria in skin of colour. Urticarial rash in skin of colour. Angioedema is more often localised. It commonly affects the face (especially presenting as swollen eyelids and lips), hands, feet, and genitalia.
Urticarial dermatitis presents with both urticaria-like and eczema -like lesions. Urticarial dermatitis usually affects elderly patients. Persistent red itchy plaques may have a smooth surface (urticaria-like) or dry scratched surface (eczema -like) They are distributed symmetrically on the trunk, upper arms and thighs.
Cholinergic urticaria is a common chronic inducible urticaria that is characterised by the presence of short-lived transient hives (itchy bumps) due to stimuli that induce sweating. It typically presents with small, raised 1–4 mm wheals which last for 15–30 minutes. It is also sometimes referred to as cholinergic angioedema urticaria or ...
Urticaria refers to a group of conditions in which weals (hives) or angioedema (swelling) develop in the skin. It is very common in children. A weal is a superficial swelling, usually pale or skin-coloured. It is often surrounded by an area of erythema and can last from a few minutes to 24 hours.
Papular urticaria presents with clusters of itchy red bumps (papules) without systemic symptoms. Most often on legs and other uncovered areas such as forearms and face. Sometimes scattered in small groups all over the body. Appear every few days during the summer or autumn months. Range from 0.2–2 cm in diameter.
2024年9月9日 · In chronic inducible urticaria, weals generally appear about 5 minutes after the stimulus and last from a few minutes up to 2 hours. The weals may change shape before resolving — they may be round, and form rings or a map-like pattern. Characteristically, weals are: Linear in symptomatic dermographism.
Urticarial vasculitis is a variant of cutaneous small vessel vasculitis. It is characterised by inflamed and reddened patches or weals on the skin that appears to resemble urticaria, but when the skin is examined closely under a microscope, a vasculitis is found (inflamed blood vessels). Urticarial vasculitis is generally classified as two types:
