1 doctor weighed in:

Can i get blisters on my tongue from giving head?

1 doctor weighed in
Dr. Daniel Wolter
Dentistry

In brief: Yes

Oral sex can lead to small bruises or sores within the mouth.
Obviously, the more energetic the act, and the longer it goes on, the more likely you are to have mouth issues. Blisters on the tongue are not all that common, but not impossible. Small bruises, hemorrhages, and blood-blisters on the palate are the most common oral problems associated with fellatio. They're rarely serious problems.

In brief: Yes

Oral sex can lead to small bruises or sores within the mouth.
Obviously, the more energetic the act, and the longer it goes on, the more likely you are to have mouth issues. Blisters on the tongue are not all that common, but not impossible. Small bruises, hemorrhages, and blood-blisters on the palate are the most common oral problems associated with fellatio. They're rarely serious problems.
Dr. Daniel Wolter
Dr. Daniel Wolter
Thank
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