A one-centimeter nodule felt under the skin can be caused by a subcutaneous lipoma, but can also be caused by fibroids, sebaceous cysts and other factors. You should go to the hospital in time to find out the cause of the disease. 1. Lipoma: mostly caused by fat cell damage or metabolic abnormalities and other factors, resulting in local subcutaneous fat cell degeneration, the formation of lumpy aggregation, may appear subcutaneous feel a one-centimeter nodule symptoms. 2. Sebaceous cysts: mostly caused by excessive oil secretion and inadequate cleaning, leading to sebaceous gland duct obstruction, sebum excretion abnormalities, can form a small knot in the subcutaneous symptoms of one centimeter. 3. Fibroma: a group of benign diseases composed of fibrous tissue, mostly occurring in the patient’s skin, subcutaneous tissue, etc., palpation can be touched with a small subcutaneous nodule, which can be up to about 1 cm. In daily life, if the symptoms of skin nodules, do not repeatedly squeeze, should go to the hospital in a timely manner for consultation, a clear diagnosis and follow the doctor’s instructions for treatment.