Pimples next to the midriff can be caused by conditions such as acne, folliculitis and eczema. 1. Acne: Acne is usually characterized by pimples, papules and pustules, and is commonly found in seborrheic areas. Acne can be caused by abnormal androgen levels, bacterial infections and other factors. 2. Folliculitis: Folliculitis is generally characterized by red papules and pustules centered on hair follicles, and the disease can develop in any area with hair. The cause of folliculitis may be due to infection of the hair follicle by pathogens such as bacteria and fungi. Factors such as hair plucking and trauma may also trigger the disease. 3. Eczema: Eczema is mainly characterized by erythema, edema and papules, and is often accompanied by itching. The cause of eczema may be related to disease, heredity, environment and other factors. There are many reasons that lead to acne next to the middle of the person, it is recommended that the patient timely medical examination, under the guidance of the doctor for standardized treatment.