Itchy wrist bumps are mostly considered to belong to eczema, atopic dermatitis, insect bite dermatitis, urticaria and other diseases, the causes of different diseases are different. 1. Eczema: the cause of the disease is not clear, may be related to food, pollen or dust and other inhalants, hot, dry or humid environment, certain diseases and other factors, manifested as erythema, papules, papules, accompanied by intense itching and other symptoms. 2. Atopic dermatitis: this disease is related to genetic factors, immune abnormalities, skin barrier function abnormalities, temperature changes, etc., lesions manifested as papules, nodules, itching, hyperpigmentation and other symptoms. 3. Insect bite dermatitis: the onset of the main insect bites, such as mosquitoes, bedbugs, fleas, lice, etc., manifested as a size of the red doughnut-like damage, some may have pseudopods, often with small blisters at the top, which can be accompanied by intense itching. 4. Urticaria: this disease often can not find a clear cause, common causes include animal protein, rotten food, inhalants, certain drugs, chronic diseases, infections, etc., manifested as limited edema, edematous erythema, accompanied by itching and other symptoms. It is recommended that patients go to the dermatology department of regular hospitals in a timely manner, and follow the doctor’s instructions to clarify the diagnosis and active treatment to avoid delaying the condition.