There are many causes of many small bumps on the back of women, such as acne, eczema, skin redundancy, etc. The causes are different and so are the treatments. 1. Acne: Acne is found on the face, but can also occur on the neck and back, where inflammatory papules, pustules and other polymorphic lesions can be seen, generally developing in patches. Patients can be treated with medication. Patients can use topical peroxymethylphenidate lotion, selenium disulfide lotion and apply it to the back when bathing; at the same time, they should also change their bad habits, such as reducing late nights, eating less spicy, greasy and sweet food, etc. 2. Eczema: Eczema causes lesions including dense corn-sized papules, papules or small blisters, with characteristics such as polymorphism, symmetry, itching and easy recurrence It is a very common condition. This can first look for disease triggers, such as work environment, diet, bad mood, etc., can first away from the environment and substances that can easily cause eczema, itching serious oral antihistamines to stop itching treatment; 3, other: herpes, urticaria, skin redundancy, etc. can also cause women to grow many small bumps on the back, there will generally be corresponding symptoms, patients should promptly identify the cause of the disease, targeted treatment. Daily should avoid excessive touching and scratching the lesions, at the same time should wear loose clothing, with breakouts pay attention to waterproofing to prevent aggravation of the disease.