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  Urticaria

  Hives, also known as urticaria, is a kind of skin rash with red, raised, itchy bumps. They may also burn or sting. Often the patches of rash move around. Typically they last a few days and do not leave any long-lasting skin changes. Fewer than 5% of cases last for more than six weeks. The condition frequently recurs.

• Adrenergic urticaria

  Adrenergic urticaria is a skin condition characterized by an eruption consisting of small (1-5mm) red macules and papules with a pale halo, appearing within 10 to 15 min after emotional upset. [] There have been 10 cases described in medical literature, and involve a trigger (coffee, intense emotions) followed by a rise in catechomines and IgE. Treatment involves propranolol and trigger avoidance.

• Galvanic urticaria

  Galvanic urticaria has been described after exposure to a galvanic (electrical) device used to treat hyperhidrosis. []

• Localized heat contact urticaria

  Localized heat contact urticaria is a cutaneous condition, one of the rarest forms of urticaria, where within minutes of contact with heat from any source, itching and whealing occur at the precise site of contact, lasting up to 1 hour.

• Pressure urticaria

  Pressure urticaria is a physical urticaria caused by pressure applied to the skin, and is characterized by the development of swelling and pain that usually occurs 3 to 12 hours after local pressure has been applied. []

• Delayed pressure urticaria

  Delayed pressure urticaria is known as one of the more painful subsets of physical urticaria due to formed hives being deep-seated and appearing after 4–6 hours.

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  Acute urticaria

  Hives, also known as urticaria, is a kind of skin rash with red, raised, itchy bumps. They may also burn or sting. Often the patches of rash move around. Typically they last a few days and do not leave any long-lasting skin changes. Fewer than 5% of cases last for more than six weeks. The condition frequently recurs.

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  Chronic urticaria

  Hives, also known as urticaria, is a kind of skin rash with red, raised, itchy bumps. They may also burn or sting. Often the patches of rash move around. Typically they last a few days and do not leave any long-lasting skin changes. Fewer than 5% of cases last for more than six weeks. The condition frequently recurs.