What is the cause of red skin itching?

Skin itching symptoms and also played a red pimple, first of all need to consider the possibility of urticaria and other diseases. Urticaria is mainly manifested as red or pale itchy skin lesions with clear edges. The etiology of urticaria is more complex. Most patients cannot find the exact cause. The common causes are as follows. 1. Food, fish, shrimp, crab and eggs are the most common. 2. Drugs, many drugs are easy to cause allergic reactions in the body, causing urticaria. 3, bacteria, viruses, fungi, parasites and other infections can also cause urticaria. 4, cold, heat, sunlight, friction and pressure and other physical stimulation factors, can also cause. 5, insect bites or inhalation of animal dander, feathers, pollen and other allergic factors. 6, mental stress can also cause urticaria. 7, other internal and systemic diseases can also become urticaria, especially chronic urticaria causes.