Slightly high echogenic mass under the skin of the right shoulder may be caused by local infection, sebaceous cyst, tumor lesion and so on. 1. Local infection: due to bacteria and other pathogens infecting the shoulder joint, when the infection is limited, an abscess can be formed, which can cause local redness, swelling, heat and pain and other clinical manifestations, and a slightly high echo mass under the skin of the right shoulder can be seen on the ultrasound examination. 2. Sebaceous cysts: Due to the secretion of subcutaneous glands, cysts are formed locally, if accompanied by calcification or infection. The patient may have a slightly hyperechoic subcutaneous mass on the right shoulder. 3. Tumor lesions: common lipoma, fibroma with local calcification or liposarcoma, fibrosarcoma and other malignant lesions, the patient may appear in the ultrasound examination of the right side of the shoulder subcutaneous slightly hyperechoic mass. The right shoulder subcutaneous slightly high echo mass may also have other causes, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.