Sliding bumps on the waist are generally considered to be symptoms of lipoma or sebaceous cysts.
1. Lipoma: It is caused by the accumulation of mature fat cells under the skin, and it occurs in the neck, shoulder, back, waist and other parts of the body. It can be manifested as the appearance of small subcutaneous bumps on the waist. Moreover, lipoma is not adherent to the surrounding tissues, and can be dragged and will have the symptom of sliding.
2. Sebaceous cyst: It is due to trauma or external bumping and squeezing, resulting in local sebaceous metabolism abnormality, excess sebum can not be metabolized out of the body to form cysts. Sebaceous cysts are usually single, manifested as soybean to coin-sized subcutaneous bumps, which can be moved under the skin without obvious discomfort, but there can be mild pressure pain when pressed. The condition usually requires no treatment, or the cyst can be surgically removed.
There may be other causes of sliding bumps on the lower back, and it is recommended to visit the hospital promptly.