Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appears suddenly– either as a result of the body’s reaction to certain allergens, or for unknown reasons.

Urticaria, also known as hives, is an outbreak of swollen, pale red bumps or plaques (wheals) on the skin that appears suddenly– either as a result of the body’s reaction to certain allergens, or for unknown reasons.