A lot of small bumps on the body may be caused by eczema, heat rash, urticaria and other factors. 1. Eczema: this disease is related to abnormal immune function, skin barrier dysfunction and other factors, divided into acute eczema, subacute eczema and chronic eczema and other types, the patient’s skin may appear rash-like lesions. 2. Heat rash: also known as prickly heat, the disease is generally due to the hot environment, sweat duct underdevelopment and other factors, after the disease may appear small blisters or papules on the skin, accompanied by tingling, itching and other symptoms. 3. Urticaria: the disease is usually caused by drugs, food, sun exposure, systemic lupus erythematosus and other factors, the patient may appear the lesions of airy bumps. There are many factors that lead to a lot of small bumps on the body, it is recommended that patients seek timely treatment, strictly comply with the doctor’s instructions for medication.