Arm acne and extrusion of white particles may be due to molluscum contagiosum, sebaceous cysts or folliculitis, it is recommended that the patient under the guidance of the doctor through the medication, surgical treatment and other ways to improve. 1. Molluscum contagiosum: Molluscum contagiosum is caused by a viral infection, and white wart-like bodies can appear by squeezing the skin lesions. In the treatment, you can go to the hospital and choose to squeeze the warts treatment, or topical antiviral drugs, such as imiquimod cream, recombinant human interferon α2b gel and so on. 2. Sebaceous cysts: Sebaceous cysts are benign skin swellings caused by blockage of sebaceous ducts. It is recommended that the walls of the cysts be removed to prevent recurrence. 3. Folliculitis: Folliculitis is an infectious, purulent skin inflammation. It can be treated with topical antibiotic ointment to fight infection, such as fusidic acid cream, mupirocin ointment and so on. For patients with arm acne and extrusion of white particles, it is recommended to go to a regular hospital in time for examination and standardized treatment under the guidance of a professional doctor.