If you are itchy and have small red bumps when you scratch, most of them are considered to be hives.1. The causes of hives are mainly related to allergies, which include food and drug allergies. The most common foods are fish, shrimp, crab, beef and mutton, and hot fruits like mangoes and durian. If you have recently taken antibiotics for a cold or fever, it can also lead to an acute allergic reaction.2. Acute urticaria is also associated with infections, such as otitis media, periodontitis, tonsillitis, pneumonia and gastroenteritis, and parasitic infections are not excluded.3. Other causes: Some immune system diseases can also trigger the rash of urticaria, such as vasculitis, systemic The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things.