Diseases that cause itchy skin bumps include eczema, urticaria, ringworm, herpetic dermatosis and so on. 1. Eczema: it is caused by various internal and external factors such as temperature, consumption of fish and shrimp and other allergic substances, manifested as symmetrically distributed, corn-sized red papules, erythema or oozing, accompanied by intense itching. 2. Urticaria: It is caused by the dilation of small blood vessels in the skin and mucous membranes. It manifests as a pink or pale-white bump on the skin, itching is very obvious, but the rash may disappear completely within a few minutes, or a few hours, but it can be repeated. 3. Ringworm: mainly caused by ringworm infection, mainly with flaking, scaling, pimples as the main manifestation, from the center gradually spread to the surrounding spread, forming a ring, with itching. 4. Herpetic dermatosis: it is caused by autoimmune reaction, manifested as flaccid blisters, easy to rupture, forming vesicles and not easy to heal, accompanied by itching, common in middle-aged and old people. Cirrhosis, malignant tumors, uremia, diabetes may also cause itchy skin pimples, it is recommended that patients go to the regular hospital in a timely manner to clarify the cause of the disease, and comply with the doctor’s instructions for standardized treatment.