There are two kinds of eye sty: First, it is external sty, which refers to acute inflammation of the sebaceous glands in the root of lash or hair follicle. It is characterized by partial redness, pain, and having a small induration. If it is serious, the entire eyelid will swell. A few days later, the root of hair follicle will have yellow pus, and it will break soon, after the pus get out, the symptoms will disappear.
Second, it is internal sty, which refers to the acute suppurative inflammation of the meibomian gland in the eyelid. The symptom is similar with external sty. But because the inflammation is in the solid meibomian organization, so it is very painful, and will last for a long time. When the yellow pus appears in the eyelid and membrane surface, it will break soon, after the pus get out, the symptoms will disappear. You should pay attention to eye health, do not touch sick position, in order to avoid infection. You can use some eye drops or eye oinment with the function of anti-inflammatory and sterilization, and also have some oral antibiotics.