More details are needed. Here are some thoughts, it can be an allergic reaction or cold sore.
Answered 3/28/2021
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It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. If you have engaged in oral sex, it could be due an STD, especially syphilis. It would be prudent to see a doctor. Wish you good health!
Answered 3/30/2021
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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