The sudden itching and bumps on the body is a common clinical skin phenomenon, which can cause itching and rashes on the body for many reasons, the most common reasons are mainly the following: 1, artificial urticaria: artificial urticaria will suddenly appear on the skin bumps or scratches, but can naturally subside, and accompanied by severe itching. 2, contact dermatitis: patients exposed to hair, dust, chemical substances, there are The actual fact is that you can get a lot more than just a few of these.