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Why does the corner of my mouth keep splitting and hurting?

I am a 31 year old male, and the cornersof my mouth split and take forever to heal. It is not a cold sore. It doesn't swell up or anything. The skin just splits and takes a long time to heal. It doesn't bleed or anything, but it hurts some.
I agree with you this does not sound like a cold sore, which would be more circumscribed and rounded and would come and go. What this sounds like instead is a condition called angular cheilitis or angular stomatitis, which is an inflammation and persistent cracking of the corners of the mouth. Most cases of angular cheilitis are easily treated, because it turns out they are closely associated with infection in the mouth with thrush, a common yeast organism! After your doctor diagnoses the condition, they will likely want to try treating it with a topical anti fungal cream, which is usually very effective. Occasionally, the angular cheilitis is caused by a bacteria instead of a fungus, in which case a topical antibiotic cream rather than an anti fungal cream is used. Some cases of angular cheilitis begin because of a nutritional deficiency, especially B vitamin deficiencies and iron deficiency. For these reasons, it is always worth having a thorough physical examination from your primary care doctor when dealing with this condition before simply brushing it off as a thrush infection (some cases may in fact be infected with thrush but may have begun because of the nutritional deficiency). Talk to your primary care doctor about this!
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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