Small granules on the back may be caused by folliculitis, follicular keratosis pilaris, molluscum contagiosum and other diseases, which need to be diagnosed according to the specific cause, and then take general treatment, medication or physical therapy. 1. Folliculitis: the formation of folliculitis needs to be considered and the proliferation of microorganisms related to the phenomenon of small particles on the back, which may also be accompanied by redness, swelling and pain. Patients can apply sulfur dioxide lotion under the guidance of the doctor, and at the same time can be used with erythromycin ointment, fusidic acid cream and other drugs externally. 2. Follicular keratosis pilaris: keratosis pilaris is formed due to the keratinization of the skin follicles behind the back, thus causing small particles to grow behind the back. Patients can follow the doctor’s instructions to apply adapalene gel, retinoic acid cream and other drugs to apply, thus helping to eliminate the purpose. 3. Molluscum contagiosum: Molluscum contagiosum can also lead to the phenomenon of the back of the small particles, the patient can go to the hospital to let the professional doctor through the scraper scraping molluscum contagiosum, scraping need to be localized tincture of iodine, and at the same time, compression to stop bleeding. If necessary, the warts can also be removed by electrocautery treatment, liquid nitrogen freezing treatment, laser treatment and other ways to remove warts. The reasons for the growth of small particles on the back are different, and the treatment modalities are also different. It is recommended that the patient consult a doctor in time, and all the above medications should be applied under the guidance of a doctor, and should not be used indiscriminately, so as not to lead to undesirable consequences.