The small flab on the neck may be caused by molluscum contagiosum, filiform warts and lipoma. 1. Molluscum Contagiosum: the reason for its formation is not clear, may be related to diabetes, viral infections and obesity and other factors, its main manifestation for the local appearance of higher than the skin surface with the tip of the organisms, usually spherical, filiform, pocket-shaped, preferably in the neck in front of the neck, neck and other places. 2. Filiform warts: the cause of its formation and HPV infection, immune deficiency and other factors related to the typical symptoms of warts in the skin hair warts, the tip of the papillomatous, common in the neck, chin and other places. 3. Lipoma: its cause may be related to genetic mutation, heredity and chronic inflammation, etc. Patients will have one or more localized lumps, which are common in the neck, shoulder and back. There are many reasons that lead to the small flab on the neck, and it is recommended that patients seek medical examination to clarify the cause.