A member asked:

Canker sore under my tongue (white center, red border, quite painful). it's been about a week and the initial site is almost gone but now there's a reddish patch to the side of that site. can canker sores do this? is this the start of a new sore?

4 doctors weighed in across 2 answers
Dr. Clarence Grim answered

Specializes in Endocrinology

Could be. Without seeing it and talking to you and knowing if you have have herpes before could I help. Show to someone who knows in Ft Worth.

Answered 9/15/2021

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It could be. Rule of thumb is that if a lesion in your mouth is not completely healed in 2 weeks, see your Dentist.

Answered 9/17/2021

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