The most common cause is by an allergic reaction to a drug.

Are you at risk for having an allergic reaction to a drug?

If your child has had a serious allergic reaction in the past, his or her risk of having another is high.

If you have had a serious allergic reaction in the past, your risk of having another is high.

He thought, I should be having a serious allergic reaction.

It is also considered less likely to cause an allergic reaction.

Try it on a small area first to make sure you don't have an allergic reaction.

After this, you may no longer have an allergic reaction.

It makes you look like you've had an allergic reaction to something.

This can cause an allergic reaction on the first administration of a drug.