Angular Cheilitis: It is abnormal for cold sores to linger for an entire month. There is a condition called cheilitis where lesions develop in the corners of the mouth and they can be persistent. They can be from lip-licking, nutrient deficiencies, dry mouth etc. These can become subject to opportunistic infections. Using a topical antibiotic and discouraging harmful behaviors (lip licking) may help.
Answered 10/4/2016
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