Itchy acne on the back may be related to Malassezia folliculitis, eczema and ringworm, and need to be targeted treatment, such as acne may need anti-inflammatory, seborrheic dermatitis often need medication to inhibit sebum secretion, and contact dermatitis may need anti-allergy and anti-itch treatment. 1. Malassezia folliculitis: is caused by Malassezia follicular inflammatory damage. It occurs in the neck, chest, shoulders and back, and is mostly symmetrical. Should choose topical antifungal drugs (such as ketoconazole cream, 50% propylene glycol), can also be supplemented with 2% ketoconazole lotion or 2.5% selenium disulfide shampoo bath. If necessary, oral antifungal drugs such as itraconazole can be combined. 2. Eczema: it is a kind of skin inflammation caused by many factors, in the treatment mainly through the glucocorticoid anti-inflammatory and antipruritic, for example, topical Dinaid cream. 3. ringworm: because the skin is infected with ringworm bacteria and a kind of disease, in the treatment of the top is mainly based on antifungal, such as miconazole nitrate cream. There may be other reasons for the itchy pimples on the back, and it is recommended to consult a doctor for standardized treatment under the guidance of the doctor. The medication should be used in accordance with the doctor’s instructions, do not self-medicate.