There is no fastest way to eliminate the ulcers at the corners of the mouth, which is also known as keratitis, it needs to be treated symptomatically and can be treated by applying medications as well as taking medications orally. Keratitis is the inflammation of the corner of the mouth area at the unilateral or bilateral union of the upper and lower lips, according to the etiology of keratitis, in general, it can be divided into malnutrition keratitis, infectious keratitis, contact keratitis, traumatic keratitis, and it can also occur at any age, most often in the elderly and children, it may be due to malnutrition, physical stimulation, immune function abnormalities caused by the infection, and it may also be infections The trauma can cause swelling, erosion and pain in the corners of the mouth. Apply medication: If it is caused by bacterial infection, it can be improved by applying gentamycin hydrochloride ophthalmic ointment and erythromycin ointment; if it is caused by viral infection, it can be improved by applying acyclovir cream and penciclovir cream; if it is caused by fungal infection, it can be treated by applying miconazole nitrate cream and clotrimazole cream. Taking drugs: if allergies caused by keratitis, need to take loratadine tablets, chlorpheniramine maleate tablets under the guidance of a doctor; if malnutrition caused by keratitis, need to be supplemented with multivitamin tablets, folic acid tablets under the guidance of a doctor to improve. Specific treatment and medication need to follow the doctor’s instructions, choose the most suitable approach.