There are usually two types of lumps on the back: a. Subcutaneous lipoma: this condition usually has no skin redness and no painful pressure around it, however, the size of the lump will gradually increase and there is no huge impact on the surrounding tissue structure. Second, local sebaceous cysts: also called chalk tumors, this is due to the accumulation of some dirty things caused by the poor excretion of sweat glands, it will gradually produce inflammatory lesions, which will stimulate the surrounding tissue structure, appearing red and swollen, when pressed with the hand will feel obvious pain, this situation can be oral antibiotics for anti-infection treatment. If it is not well controlled, surgery is required to remove or drain it. In both cases, ultrasound is usually needed to make a clear diagnosis and to see the exact depth of the lesion for targeted treatment.