The main reasons for the feeling of a ball in the chin include the following, first of all, it is considered to be caused by the swelling of the lymph nodes at the chin. There are submandibular lymph nodes in the chin. If the lymph nodes are enlarged due to long-term chronic inflammation, including pharyngitis and gingivitis, the lymph nodes in the chin will become swollen and resemble a ball, which can be clarified by ultrasound examination. The second cause is considered to be due to the swelling of the soft tissue at the chin. When the sebaceous glands at the chin are in full secretion, resulting in blockage of the sebaceous ducts, sebaceous cysts are formed, which in turn look like a ball to the touch. The typical manifestation of this is a black head on the surface of the lump, and squeezing the black head will result in the overflow of white powder-like material. The third reason is that the ball is formed due to soft tissue infection at the chin, and is mostly accompanied by pain, redness and swelling and other inflammatory manifestations. Need to apply antibacterial drugs with symptomatic treatment.