Dense black dots on the pores of the back may be caused by enlarged pores, blackheads and acne, keratosis pilaris and other factors. 1. Coarse pores: Coarse pores are related to heredity, if you usually do not pay attention to personal hygiene, dirt into the pores, resulting in a lot of black spots on the back. It is recommended to take a shower regularly, develop good living habits, and use skin cleansing products when necessary to avoid the accumulation of dirt in the pores, which can help to improve. 2. Blackheads and pimples: Dense black dots in the pores of the back can also be considered to be related to blackheads and pimples. Abnormalities in the pores of the follicles or keratinization block the mouth of the follicles, sebum gathers locally, and air oxidation can form black spots. 3. Keratosis Pilaris: Keratosis Pilaris is a hereditary disease that tends to occur on the extensor side of the arms, and may also occur on the back and cheeks, resulting in the appearance of many localized black dots. There are many reasons for the appearance of black dots on the back, it is recommended to go to the hospital for examination, to clarify the cause of the disease, and follow the doctor’s instructions for treatment.