In this case, they usually break out within a few hours of the exposure.Usually, the patients figure out the cause by themselves, and they never bother coming to a doctor.While the itch can be intense, the skin is usually not scabbed or broken. Hives are very common with 10-20 percent of the population having at least one episode in their lifetime.Hives can sometimes occur in deeper tissues of the eyes, mouth, hands or genitals. Fewer than 5% of cases last for more than six weeks. Prevention is by avoiding whatever it is that causes the condition. Typically they last a few days and do not leave any long-lasting skin changes.This helps to prevent inflammation and eases allergic reactions.If you have a severe allergic reaction, your symptoms may include: This type of severe reaction is called anaphylaxis. Anaphylaxis is commonly triggered by an allergy to wasp and bee stings, latex, and certain foods, including eggs, fish, shellfish, cow’s milk and nuts. If you have anaphylaxis, it’s important that you get medical help immediately, as it can be very serious and you need an adrenaline injection.
An injection can be given in case of severe allergic reaction (although in such cases, adrenaline (epinephrine) may be more appropriate and can be life-saving).
Cases of short duration occur equally in males and females while cases of long duration are more common in females.
Cases of short duration are more common among children while cases of long duration are more common among those who are middle aged.
They do not always completely control the allergic reaction because they do not counteract other chemicals that may be responsible for the symptoms.
There are at least two kinds of histamine receptors, hence are mainly H1 blockers.