Itchy red bumps when you scratch, you may be suffering from hives, eczema. Urticaria is a common skin disease, which may be triggered by mechanical stimulation of the skin, contact with allergens, mental stress, physical overwork and other reasons. The patient may develop windswept masses of varying sizes and shapes with localized itchiness, resulting in itchy red bumps when the patient scratches. Eczema is related to the presence of chronic inflammation in the body, diet or stimuli such as pollen, dust or mental stress, resulting in a perverse reaction in the skin. It manifests itself as itchy skin accompanied by red pimples. Often too much scratching will cause redness, swelling, oozing, erosion and other symptoms, easy to recur. The cause of itchy red bumps may also be caused by other reasons, it is recommended to go to the hospital for examination to clarify the cause of the disease and then carry out relevant treatment.