The black spots in the hair follicles of the back are usually not mites, there may be sebaceous cyst openings, there may be blackheads acne and other reasons. 1. Sebaceous cyst openings: hair follicles sebaceous gland blockage, sebaceous gland secretions can not be discharged in a timely manner, may result in cystic structures, some of the cysts can be seen in the center of the black openings, potentially leading to black spots on the back. 2. Blackheads: a type of acne, mainly due to the follicle sebaceous gland secretion increase, the follicle sebaceous gland conduit discharge secretion is not smooth, secretion stagnation, and the local air oxidation reaction caused by the skin blackheads, can also cause back pores in the black spot symptoms. There may be other reasons for the black spots in the pores of the back, it is recommended to go to the hospital in time to check, follow the doctor’s instructions to standardize the treatment.