The most common type of back bump is folliculitis, which is also a type of acne, because the back is an area with more sebaceous glands and is prone to oil production, which can be combined with bacterial infections. Red papules or pustules on the back can be painful when pressed. For the treatment of back sores, you can apply topical 2% ketoconazole lotion, which has an anti-inflammatory and antiseptic effect. For red papules and pustules, topical anti-bacterial infection medications such as fusidic acid cream or clindamycin gel can be applied. Patients should pay attention to clean the skin carefully, eat no spicy and stimulating food, and eat less sweet and greasy food.