A right buttock subcutaneous mass with no significant blood flow signal means that there is no significant blood supply to the mass here, which is a better sign. Subcutaneous mass without significant blood flow signal is usually described by ultrasonography, the absence of blood supply means there is no supply of nutrients, indicating that the mass is growing slowly and the probability is benign. Diseases that cause this manifestation may include lipoma, subcutaneous cysts, etc. If there are no symptoms do not need to be treated, but you need to review the size of the mass regularly. And if it is a malignant tumor, then it requires more nutrients, and there will be more blood vessels around it, and rich blood flow signals are usually visible on ultrasound. If there are obvious symptoms such as this mass, it is necessary to further improve the relevant examination to clarify the cause of the disease, and symptomatic treatment under the guidance of the doctor.