I. There are four types of blepharitis: dry blepharitis, scaly blepharitis, ulcerative blepharitis, and canthal blepharitis. 1. Dry blepharitis: a milder form of blepharitis in which the surface of the lid margin is simply congested, often accompanied by conjunctivitis of the lid. Refractive error, strenuous close work, air contaminated with chemical dust, hyperthermia, and the bad habit of rubbing the eyes with the hands can all increase lid margin congestion. 2. Scaly blepharitis: In addition to lid margin congestion, epithelial scales are attached to the eyelashes and the lid margin surface, and the surface of the lid margin is dotted with sebum. The scales and scabs are removed to reveal a congested lid margin surface without ulcers or pus spots. Patients feel tingling and itching, mainly due to excessive secretion from the sebaceous or lid glands. 3. Ulcerative blepharitis: The symptoms are more severe, with more sebum secretion and dry scabs that stick the lashes into bundles. Removal of the scabs reveals the root of the lashes and bleeding ulcers with small pustules. The eyelashes tend to fall out and do not regrow easily, resulting in bald eyelashes or malpositioned eyelashes. The eyelashes may form and rub against the cornea. Conjunctivitis and hypertrophy of the eyelid margin can lead to tearing, eczema of the lower lid skin, and ectropion of the lid over time. Treatment: As above, but the eyelashes with folliculitis must be removed and then treated. 4. Canthal blepharitis: mainly Morax-Axenfeld bifidus infection. The lesions are mostly bilateral, in the outer canthus. The main symptom is a prickly itching sensation. Treatment: 0.5% zinc sulfate eye drops, iodophor in and around the lid margin first, then zinc sulfate eye ointment. Also take oral vitamin B complex, especially riboflavin. Treatment: 1. Remove the cause and avoid all irritating factors. If there is refractive error, it should be corrected. Pay attention to nutrition and physical exercise to improve the immunity of the body. 2. Use iodine swabs to remove the scab and squeeze out the excess secretions from the lid gland to clear the drainage opening. Apply the swab 3 times a day and then apply antibacterial eye ointment after the swab has healed, once a day for 2 weeks to prevent recurrence.