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  • Urticaria (Hives): a complete overview - DermNet
    Urticarial weals can be a few millimetres or several centimetres in diameter, coloured white or red, with or without a red flare Each weal may last a few minutes or several hours and may change shape Weals may be round, or form rings, a map-like pattern, or giant patches Urticaria can affect any site of the body and tends to be distributed
  • Urticaria and urticaria-like conditions - DermNet
    Urticaria, urticaria-like weals, eczema-like lesions, blisters and target lesions may occur; It is prevented when ovulation is prevented by an oral contraceptive agent; Interstitial granulomatous dermatitis Interstitial granulomatous dermatitis is a distinctive pathological entity of an unusual persistent skin eruption often of an urticarial type
  • Chronic spontaneous urticaria - DermNet
    Urticaria is a condition characterised by the presence of weals (hives) and angioedema A weal is a superficial red or pale skin swelling, usually surrounded by erythema, which can persist from a few minutes to 24 hours Weals are generally very itchy, but can also cause a burning sensation
  • Chronic inducible urticaria - DermNet
    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; Confined to contact areas in contact
  • Acute urticaria: Causes, Features, and Treatment — DermNet
    Weals are due to release of chemical mediators from tissue mast cells and circulating basophils These chemical mediators include histamine, platelet-activating factor and cytokines The mediators activate sensory nerves and cause dilation of blood vessels and leakage of fluid into surrounding tissues Bradykinin release causes angioedema
  • Chronic urticaria - DermNet
    Weals are due to release of chemical mediators from tissue mast cells and circulating basophils These chemical mediators include histamine , platelet -activating factor, and cytokines The mediators activate sensory nerves and cause dilation of blood vessels and leakage of fluid into surrounding tissues
  • Urticaria in children - DermNet
    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 Children will usually complain of itch and
  • Vibratory urticaria - DermNet
    Weals most often appear on the hands and trunk, the parts of the body most exposed to vibration stimuli The weals cause itching, burning, and prickling sensations What are the complications of vibratory urticaria? Systemic progression of vibratory urticaria may rarely occur after extensive exposure to a vibratory stimulus Symptoms may include:
  • Dermographism
    Linear broad erythematous flare and 1–2mm weals following stroking Non-urticarial forms of dermographism White dermographism White line (without a weal) following the scratch can be seen in atopic dermatitis or other forms of dermatitis Black dermographism Black or green line (without a weal) related to pressure and staining from a metal
  • Delayed pressure urticaria - DermNet
    Weals may be accompanied by fever, malaise, fatigue, and occasionally chills, headache and general joint aches Affected areas may be resistant to the development of new lesions for 1-2 days Up to 60% of patients with pressure urticaria also have chronic urticaria , immediate and or delayed dermographism , and or angioedema





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