Pestle finger can be caused by trauma, inflammation of the joints, and skin lesions. Pestle finger is mainly characterized by hyperplasia and enlargement of the terminal nail bed, bending of the longitudinal and transverse ridges, and bulging like a drumstick. 1. Trauma: after the end finger extrusion injury or fracture, osteoarticular cartilage damage, subchondral bone stimulation hyperplasia, joint hypertrophy, with or without joint cavity effusion and synovitis, may appear injured finger pestle finger-like changes. The single finger part of the excessive force extrusion, this situation will also lead to finger endings blood flow is not good, thus triggering pestle-like finger changes. 2. Joint inflammation: idiopathic osteoarthritis can lead to changes in the cartilage matrix, the initial single or several finger hyperplasia and hypertrophy of the pestle finger. 3. Skin lesions: Contact dermatitis or allergic reactions can lead to significant swelling of the fingers, and the clinical presentation is similar to that of pestle finger. It is recommended to go to the hospital for examination to identify the cause of the disease and treat it as soon as possible.