Most scaly blepharitis are oval dermatophyte infections, most ulcerative blepharitis are Staphylococcus aureus infections, and most canthal blepharitis are Mo-Abis infections. In addition, vitamin deficiency, refractive error of vision fatigue, general malnutrition, poor quality cosmetics, and poor hygienic habits are also causative factors. The symptoms of blepharitis are divided into three types of blepharitis (1) scaly blepharitis. The symptoms are congestion of the lid margin, flushing, seborrhea from the eyelashes and lid margin, easy loss of eyelashes, itchy eyes, a burning sensation on resignation, and exposure of the congested area without ulcers or pus spots. (2) Ulcerative blepharitis. The itchy, stinging, burning sensation is more pronounced, there is more sebum at the lid margin, small pustules are scattered at the roots of the eyelashes, small ulcers, etc. are mostly covered with scabs, and the eyelash follicles are destroyed and easily shed with the scabs but do not regenerate. (3) Blepharitis of the canthus. In addition to the itchy foreign body sensation and burning sensation, the skin of the lid margin is congested and swollen with infiltration and erosion, often accompanied by congestion and hypertrophy of the adjacent conjunctiva and mucous secretions. 2. The most important thing to remember is that you should be able to get a good idea of what you are doing. (2) Scaling: remove the scab after washing with soap and water or 2% sodium bicarbonate solution and rub the lid margin with 1 to 2% mercury or antibiotic corticosteroid ointment 2 to 3 times a day and continue for 2 weeks after healing to prevent recurrence. (3) Ulcerative: After removing the scab as above, pick open the pustule, remove the affected eyelashes, and then apply antibiotic or sulfonamide eye ointment. This disease is more stubborn and treatment should be thorough and uninterrupted. The medication should be continued for three weeks after the condition has improved to prevent recurrence. Repeated and long-standing cases should be subjected to bacterial culture and drug sensitivity testing to select effective drugs, and may be treated with home-based vaccines or staphylococcal toxoid therapy. (4) Canthal sex: Use 0.5% zinc sulfate solution to dot the eyes, this drug can stop the proteolytic enzymes produced by Mo-Arthrobacter from eroding the tissue, so it is effective. Topical antibiotics or yellow mercury eye ointment are then applied. 4. Is blepharitis contagious? It is not contagious if it is caused by poor quality cosmetics or refractive error, but it is contagious if it is a bacterial or viral infection.