sty is acute purulent inflammation of eyelid gland. Chinese medicine is called eye of a needle. It is caused by staphylococcal infection. Refraction, diabetes, digestive dysfunction, physical weakness and bad hygiene habits are easy for habitual users to suffer from this disease. There are internal and external differences, which occur in eyelashes, hair follicles or surrounding sebaceous glands, and are called external styes; Those who occur in meibomian gland are called internal styes. This disease is a common disease, mostly seen in teenagers, with a good prognosis and no damage to vision. However, repeated or frequent cases may affect the appearance or function of eyelids in the future.