Finger mucous cysts are usually caused by trauma, inflammation, mucinoma degeneration and other reasons. 1. Trauma: finger mucous cysts are usually caused by trauma resulting in rupture of the glandular ducts, so that capillary rupture of red blood cells leakage, so that the blood can not be normal reflux, the soft tissues are bound by the binding force is reduced and flaccid, thus forming finger mucous cysts. 2. Inflammation: inflammatory stimulation will generally compress the surrounding tissues and nerves, patients usually feel local redness, swelling, heat and pain and other symptoms, may form finger mucous cysts, can be surgically removed under the guidance of the doctor. 3. Mucinous cyst degeneration: Mucinous cyst degeneration generally refers to the accumulation of mucopolysaccharides and proteins in the skin, mucinous cysts are generally rich in albumin and glycoproteins, so they will form mucinous cysts of the fingers. Patients should identify the cause of the disease under the guidance of the doctor and actively cooperate with the treatment.