Small white particles on the neck may be caused by acne, infectious molluscum contagiosum, seborrheic dermatitis and other diseases. 1. Acne: The cause is mostly related to heredity, increased sebum secretion, microbial infection and other factors. The patient will appear white and yellowish-white pimples. 2. Molluscum contagiosum: mainly due to molluscum contagiosum virus infection, the patient is mainly manifested as white or yellowish corn size papules. Some of the patients will have small white particles on their necks. 3. seborrheic dermatitis: the cause of the disease is not clear, mostly with genetic, microbial stem infection, immune dysfunction and other factors, good in the face, neck, chest and back. Patients are mainly manifested as yellow-red patches, and some patients will appear the phenomenon of small white particles. There are many causes of white granules on the neck, and it is recommended that patients go to the hospital to clarify the cause of the disease.