The causes of dense black dots on the back pores include acne, perifollicular keratosis, common warts, inflammatory hyperpigmentation, etc. Treatment includes medication and physical therapy. 1. acne: if a variety of factors triggered by the follicle conduit blockage after the formation of black pimples, can follow the doctor’s instructions for external use of retinoic acid cream to remove the keratin plug treatment. 2. Keratosis pilaris: If the black spots are caused by keratosis pilaris, usually no treatment is needed, if the symptoms are serious, you can follow the doctor’s instructions to use retinoic acid cream to remove the keratin plug treatment. 3. common warts: if it is human papilloma virus infection caused by common warts, you can follow the doctor’s prescription external recombinant human interferon α2b cream and other drugs anti-virus treatment. You can also use physical therapy, under the operation of the doctor to use liquid nitrogen freezing or laser to get rid of. 4. Inflammatory hyperpigmentation: If the black spots are inflammatory hyperpigmentation, you can utilize laser lightening treatment under doctor’s operation. If there is the phenomenon of dense black spots on back pores, please go to the hospital in time for examination and treatment under the guidance of doctors.