In the clinic, parents often confuse mydriasis with chalazion. A stye is an acute septic inflammation of the eyelid glands and sebaceous glands of the eyelash follicles, characterized by redness, swelling, and pain. There are two types of wheals depending on the site of infection: external wheals (also known as external blepharitis) and internal wheals (also called inflammatory chalazion). A. External mellitus is easier to identify from chalazion. Etiology: External mellitus is caused by acute infection of the sebaceous glands of the eyelash follicles and the sweat glands of the eyelashes with staphylococci. Diagnosis: 1. The onset is short, usually a few days, with localized redness and swelling of the eyelid skin, pressure with hard nodules and pressure pain, usually at the root of the eyelashes, and the baby usually refuses to touch or cries after touching due to pain. The pain is relieved immediately after the abscess breaks down and is removed, and the redness and swelling gradually subsides. 3. More severe cases may develop into eyelid cellulitis with enlarged and painful preauricular lymph nodes. Treatment: 1. Early localized hot compresses and intraocular drops of anti-inflammatory ophthalmic ointment should be applied diligently. 2.If the abscess is immature with obvious local redness and swelling or with symptoms of systemic infection, in addition to the local treatment mentioned above, medical consultation should be conducted as early as possible and systemic treatment with antibacterial agents should be applied at the same time. 3.If the abscess is mature, when the redness and swelling are limited, the pain is relieved and yellow pus head appears, and there is a fluctuating feeling when pressed, the abscess should be incised and drained in hospital. In contrast, chalazion mainly manifests as painless mass, and the onset time is longer, ranging from a few weeks to several months. Because chalazion is a wrapped granuloma, the general effect of medication is not good, so parents are reminded that if you find that your child’s “eye of the needle” medication does not work, you must think about whether it is chalazion, as soon as possible to specialist hospitals, so as not to miss the time of treatment. The reason for this is the acute infection of the lid gland by staphylococcus. It is characterized by a “painful mass”. Diagnosis: 1. The symptoms are generally the same as those of external wheals, but the pain is more intense because the lid gland is located in dense fibrous tissue. 2. Early lid conjunctiva is congested and a yellow pustule appears on the conjunctival surface a few days later. 3. If the inflammation is not controlled, the inflammation may spread to form an eyelid abscess or eyelid cellulitis. Treatment: As with external mydriasis, an incision perpendicular to the lid margin should be made from the conjunctival surface to drain the pus after the abscess has formed. When the redness and swelling gradually improves, some of the masses can completely subside and be absorbed and healed; others will form small painless masses within the eyelid, at which point they are transformed into chalazia and need to be examined by a doctor to grasp the timing of surgery to prevent the masses from further breaking down into the skin and forming a scar.