The term “on fire” is a traditional Chinese medical term that refers to the invasion of heat into the body causing dizziness, sore throat, and hot nasal cavity. Some people believe that mydriasis is caused by fire, but mydriasis is usually a clinical term for blepharitis, which is considered to be a local inflammatory condition caused by an infection, most often by Staphylococcus aureus. Bacteria entering through the opening of the lid gland and causing infection of the lid gland is called endophthalmitis, and if it leads to infection of the eyelash follicles and their accessory sebaceous glands, it is called exophthalmitis. In general, inattention to hand hygiene, poor eye hygiene, and low immunity can lead to Staphylococcus aureus infection and thus blepharitis: 1. Inattention to hand hygiene: If adults or young children do not pay attention to hand hygiene, rub their eyes after touching dirty objects frequently, or wear contact lenses directly with their hands without cleaning them, this can lead to bacterial infection and blepharitis; 2. The first thing you need to do is to clean your eyes after you have put on your makeup, so that the bacteria can multiply and cause blepharitis. This can be caused by the use of improper eye care products, which can block the lid gland and cause blepharitis secondary to infection; 3. Low immunity: some diseases such as diabetes and hyperlipidemia can cause blepharitis due to a decrease in their immunity to bacteria; 4. Other: prolonged use of computers can cause dry eyes, which can also cause blepharitis secondary to infection, and blepharitis secondary to blepharitis in patients with blepharitis. Therefore, it is important to pay attention to eye hygiene in daily life and not to wipe your eyes with unclean tissues or towels. Pay attention to a healthy diet, eat less overly oily or spicy stimulating foods, and keep your mood happy. At the same time, you can do physical exercise to enhance your physical fitness and reduce the occurrence of infection. The disease can be treated by a doctor in time to relieve the discomfort, usually with medication and, if necessary, with incision and drainage.