A bag on the eyelid with visible pus is called a blepharitis, or wheals, which can develop into an abscess or pus at a later stage. The first stage of a stye is a red nodule, redness, and tenderness, and once the inflammation is not controlled in time, an abscess or pus will form. In this case, it is necessary to go to the hospital to incise and drain the pus, and may also need to place drainage strips to completely drain the internal pus. Only when the pus is completely drained will the pustule, or wheals, gradually subside. The whole process requires the use of anti-inflammatory medications, such as Topaz ophthalmic ointment or Ofloxacin ophthalmic ointment, which need to be used all the time, and also oral antibiotics for combined anti-inflammatory treatment to make the abscess go down as soon as possible.