Itchy red bumps on the elbow may be caused by urticaria, neurodermatitis, eczema and other reasons. 1. Urticaria: due to friction, oral medication, cold air stimulation and other reasons, localized skin itching, and in the corresponding parts of the appearance of the wind, the wind round or oval. It causes red bumps on the elbow that are very itchy. 2. Neurodermatitis: neurodermatitis of the elbow due to mental stress, chronic friction and other reasons. The performance of localized flat papules, accompanied by itching. The formation of red bumps on the elbow is very itchy clinical symptoms. 3. Eczema: due to elbow trauma, sweat, friction and other reasons in the elbow chronic eczema, resulting in elbow pit pimples, epidermal roughness, itching and other symptoms. The formation of red bumps on the elbow is very itchy clinical symptoms. Itchy red bumps on the elbow should be treated promptly, and the cause should be identified and treated under the guidance of a professional doctor.