Fatty granules are milia, which are retention cysts originating from the epidermis or epithelium of the appendages. Can be divided into primary and secondary two kinds, primary often no obvious cause, secondary often occur in trauma, skin disease. 1. Primary: can start from the neonatal period, by the undeveloped sebaceous glands or cuirasses funnel part of the lower end of the epithelium formed, the damage can be naturally subside; 2. Skin trauma: when the skin of the neck is subjected to minor trauma, a small white capsule may gradually form in the process of self-repair, and finally develop into a fat grain. 3. Dermatologic diseases: physical damage and histologic inflammation of the skin from herpes zoster and herpetic diseases can induce milia. Neck long cornus rash, it is recommended to go to the hospital in time, under the guidance of the doctor standardized treatment.