Erythromycin ophthalmic ointment is effective for bacterial infected corns because erythromycin has a strong inhibitory effect on Staphylococcus aureus and streptococcus. However, the use of erythromycin eye ointment needs to be combined with other medications, such as oral broad-spectrum antibiotics, to improve symptoms such as flushing, blistering, cracking, erosion, crusting, and flaking of the corners of the mouth. In addition to bacterial infectious stomatitis, stomatitis also includes several types of malnutrition stomatitis, fungal infectious stomatitis, contact stomatitis, traumatic stomatitis and stomatitis caused by oral diseases, etc. The use of erythromycin ointment for these types of stomatitis is usually not effective and requires appropriate treatment according to the different types: 1. Malnutrition stomatitis: due to riboflavin deficiency, it can be accompanied by symptoms such as strawberry tongue and scrotal itching. Excessive physical exertion or weakness, malnutrition, etc. can cause this disease, need to supplement vitamin B6, iron, protein and other treatment; 2, fungal infection keratitis: often caused by Candida albicans infection, the local use of mycoplasma liquid cleaning, wipe dry, followed by local application of mycoplasma, clotrimazole, etc.. This time the use of erythromycin ophthalmic ointment does not work, because erythromycin is useless for fungi; 3, viral infection keratitis: often caused by herpes simplex virus, visible blisters, easy to recur, the course of the disease is self-limiting, can be topical acyclovir ointment to shorten the course of the disease; 4, contact keratitis: caused by contact with allergic substances, such as some lipstick, ointment and other cosmetics, should immediately stop using allergenic substances, the symptoms of serious can be in the doctor 5, traumatic stomatitis: caused by acute trauma or severe physical stimulation. The damage is often unilateral in the corner of the mouth area, visible as fresh wounds, and often with oozing blood, may be accompanied by local tissue edema, subcutaneous bruising, pay attention to local disinfection and anti-inflammatory treatment; 6, oral disease caused by the corner of the mouth: the condition is stubborn and easy to recurring should consider stomatological consultation, exclude and correct oral diseases, keep the corner of the mouth area dry.