All about allergy

Hives is a rash of smooth, raised, pink or reddish bumps of different sizes called wheals that comes on suddenly. The wheals look something like mosquito bites. They may cover all or part of the body and are usually very itchy.
Hives usually appear first on the covered areas of the skin such as the trunk and upper parts of the arms and legs.
Wheals appear in batches. Each wheal may last from a few minutes to 6 hours. As wheals disappear, new ones form. A case of hives usually lasts at most a few days.
Hives are usually patchy at first, but the patches may run together until the hives cover most of the body.
The patches can be small or large. They are usually irregular in shape. Often, the patches have clearing of the redness in the center with a red halo or flare at the edges.
The itching is often very intense.
Angioedema is related to hives but has a different appearance. Angioedema describes marked swelling, usually around the eyes and mouth. It may also involve the throat, tongue, hands, feet, and/or genitals.
The skin may appear normal, without hives or other rash.
The eyes may appear swollen shut.
The swellings usually do not itch, but may be painful or burning.
The swellings may not be symmetrical (the same on both sides of the body).
Like hives, the swelling of angioedema can go away on its own.
Other, more severe allergic reactions may occur with hives or angioedema. A reaction may start with hives or angioedema and then progress rapidly to more serious symptoms. The most serious reactions, which can be life-threatening emergencies, are called anaphylactic reactions. The symptoms of an anaphylactic reaction include the following:
Swelling of the face, tongue, or throat
Wheezing, a raspy sound when you breathe
Difficulty breathing
Difficulty swallowing
Tightness in the throat or chest
Rapid or irregular heart beat
Dizziness or faintness
Loss of consciousness
The dizziness, faintness, and loss of consciousness are caused by dangerously low blood pressure, also called shock.

Allergy journal

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