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A 47-year-old member asked:

is there a difference between a blister/cold sore and a canker sore?

2 doctor answers7 doctors weighed in
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
Cold sore is herpes: Cold sores or fever blisters are caused by herpes simplex type i (hsv 1).
Dr. Anifat Balogun
ENT and Head and Neck Surgery 29 years experience
Cold vs Canker sore: A cold sore or fever blister typically occurs outside the mouth; around the lips, chin and just under the nose, and are caused by herpes simplex virus type 1. In the event that a cold sore occurs in the mouth, you'll see it on the gum or soft palate. Canker sores typically erupt inside the mouth; on the tongue, inner lip and lining of cheeks. Exact cause is unknown.

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A 38-year-old member asked:

How do a blister/cold sore and a canker sore differ?

2 doctor answers2 doctors weighed in
Dr. Robert Jackson
Dermatology 43 years experience
UUsually: Usually caused by herpes for cold sore and canker sore is usually autoimmune. Please see your dermatologist for evaluation and to discuss treatment options.

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Last updated Jan 1, 2021
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