Canker Sores (Aphthous Ulcers)
Canker Sores is a form of mouth ulcer that is non-infectious but tends to recur. It is commonly present on the oral mucosa of the cheeks, lips, tongue, and throat.

Canker Sores begins with a localised swelling of the affected oral mucosa to form a small round or oval shaped blister. Within a day, the blister bursts and becomes a whitish or yellowish ulcer with a red margin.
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