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Hi and thanks for your query.
This seems like oral thrush, infection of the tongue with a fungal infection caused by candida albicans.
Not precisely an STD but can spread if oral sex is performed on an infected genitalia.
I would suggest that you visit your PCP and have a swab sent for fungal culture.
For the time being, you should start on Oral anti fungal drops like Nystatin oral drops or Daktrin oral gel. You might be able to find these over the counter. Keep a good oral hygiene, chlorhexidine mouth wash for gargles, thrice a day.
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Burn roof of mouth near front