Itchy skin with small bumps may be related to urticaria, eczema, scabies, fungal infections, allergies and other conditions. 1. Urticaria: If the itching is intense, with small red bumps on the itchy area, which form into small pieces to form the shape of doughnuts, and usually subside within 24 hours, it can be considered as urticaria. 2. Eczema: If the skin has red bumps with flushed base, the bumps are connected into small pieces with blisters and itching symptoms, and there is yellow liquid coming out after scratching, forming yellow crusts, it can be considered as eczema. 3. Scabies: If the itching sensation is aggravated at night and alleviated during the day, and there is itching sensation all over the body, and there are obvious pimples and nodules in the folded areas such as finger crevices, perineum, and so on, and they have been living outside, it can be considered as scabies caused by scabies insect infection. 4. Fungal infection: ring-shaped skin enlargement of erythema, papules with flaking and itching symptoms, can be considered to be a fungal infection caused by ringworm. 5. Allergy: contact with animal hair, pollen and other allergens can lead to itchiness, accompanied by pimples and red spots all over the body. As the causes of the disease are many, patients should consult the doctor in time to clarify the cause of the disease and strictly follow the doctor’s instructions for treatment.