6 doctors weighed in:
What causes cold sores in the corner of my mouth?
6 doctors weighed in

Dr. Heidi Nelson
Dentistry
1 doctor agrees
In brief: Fungal infection
Cracking and chapping in the corners of the mouth is usually not cold sores, but is a condition called angular cheilitis, due to a fungal (yeast) infection called candida.
It's common in denture wearers and others where the bite is over closed and where drooling tends to occur. An antifungal cream, nystatin, is used and the denture may be soaked in Nystatin solution. A new denture may be needed.

In brief: Fungal infection
Cracking and chapping in the corners of the mouth is usually not cold sores, but is a condition called angular cheilitis, due to a fungal (yeast) infection called candida.
It's common in denture wearers and others where the bite is over closed and where drooling tends to occur. An antifungal cream, nystatin, is used and the denture may be soaked in Nystatin solution. A new denture may be needed.
Dr. Heidi Nelson
Dr. Heidi Nelson
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Dr. Mark Bornfeld
Dentistry
1 doctor agrees
In brief: Herpes simplex virus
Cold sores are a re-activation of latent herpes simplex virus infection, at the corners of the mouth or elsewhere.
Not all sores at the corners of the mouth are cold sores, though; more commonly, cracking or oozing of the skin here represents "angular cheilitis"--the result of frequent exposure to saliva, and may become secondarily infected by bacteria or yeast. See your dentist for more info.

In brief: Herpes simplex virus
Cold sores are a re-activation of latent herpes simplex virus infection, at the corners of the mouth or elsewhere.
Not all sores at the corners of the mouth are cold sores, though; more commonly, cracking or oozing of the skin here represents "angular cheilitis"--the result of frequent exposure to saliva, and may become secondarily infected by bacteria or yeast. See your dentist for more info.
Dr. Mark Bornfeld
Dr. Mark Bornfeld
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Dr. Phillip Frist
Dentistry
1 doctor agrees
In brief: Cold sore???
Cold sores in the corner of your mouth is an unusual area.
Not impossible but unusual. Other sores in this area can be a vitamin deficiency, or a drooling problem while sleeping at night. Or an overclosure problem if you wear dentures.

In brief: Cold sore???
Cold sores in the corner of your mouth is an unusual area.
Not impossible but unusual. Other sores in this area can be a vitamin deficiency, or a drooling problem while sleeping at night. Or an overclosure problem if you wear dentures.
Dr. Phillip Frist
Dr. Phillip Frist
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Dr. LUIS IRIZARRY
Family Medicine
In brief: Herpes virus
Can cause fever blisters.
Cold sore at the corner of mouth could be due to dry air, .

In brief: Herpes virus
Can cause fever blisters.
Cold sore at the corner of mouth could be due to dry air, .
Dr. LUIS IRIZARRY
Dr. LUIS IRIZARRY
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