With blistering, this qualifies as a second degree burn.
These generally need to be examined.
Antibiotic cream is generally applied.
Blisters should not be popped.
It can be covered with a sterile gause bandage.
Oral pain killers are used as you are doing.
If less then 3 inches...it can be treated as a minor burn.
Here is a mayo clinic guideline.
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